Add 'meta/' from commit 'f88d1f18953f9619444d56756702c7eb54580ab1'

git-subtree-dir: meta
git-subtree-mainline: 5c7048091e3a191e8a34f26852a8976b254e339b
git-subtree-split: f88d1f18953f9619444d56756702c7eb54580ab1

62 files changed, 12960 insertions, 0 deletions

diff --git a/meta/.dockerignore b/meta/.dockerignore
new file mode 100644
index 0000000000..373630e9e5
--- /dev/null
+++ b/meta/.dockerignore
@@ -0,0 +1,11 @@
+.git/
+.idea/
+
+caches/
+.idea/
+__pycache__/
+public/
+
+launcher/
+upstream/
+config/
diff --git a/meta/.envrc b/meta/.envrc
new file mode 100644
index 0000000000..3550a30f2d
--- /dev/null
+++ b/meta/.envrc
@@ -0,0 +1 @@
+use flake
diff --git a/meta/.gitignore b/meta/.gitignore
new file mode 100644
index 0000000000..7f7232ca89
--- /dev/null
+++ b/meta/.gitignore
@@ -0,0 +1,17 @@
+.idea/
+
+# direnv / Nix
+.direnv/
+.pre-commit-config.yaml
+
+result
+
+public/*/
+
+caches/
+!caches/*/.keep
+cache/
+__pycache__
+config.sh
+launcher
+upstream
diff --git a/meta/COPYING b/meta/COPYING
new file mode 100644
index 0000000000..d189af8385
--- /dev/null
+++ b/meta/COPYING
@@ -0,0 +1,52 @@
+Microsoft Public License (Ms-PL)
+
+This license governs use of the accompanying software. If you use the
+software, you accept this license. If you do not accept the license, do not
+use the software.
+
+1.  Definitions
+The terms "reproduce," "reproduction," "derivative works," and "distribution"
+have the same meaning here as under U.S. copyright law. A "contribution" is
+the original software, or any additions or changes to the software. A
+"contributor" is any person that distributes its contribution under this
+license. "Licensed patents" are a contributor's patent claims that read
+directly on its contribution.
+
+2.  Grant of Rights
+     (A) Copyright Grant- Subject to the terms of this license, including the
+     license conditions and limitations in section 3, each contributor grants
+     you a non-exclusive, worldwide, royalty-free copyright license to
+     reproduce its contribution, prepare derivative works of its contribution,
+     and distribute its contribution or any derivative works that you create.
+
+     (B) Patent Grant- Subject to the terms of this license, including the
+     license conditions and limitations in section 3, each contributor grants
+     you a non-exclusive, worldwide, royalty-free license under its licensed
+     patents to make, have made, use, sell, offer for sale, import, and/or
+     otherwise dispose of its contribution in the software or derivative works
+     of the contribution in the software.
+
+3.  Conditions and Limitations
+     (A) No Trademark License- This license does not grant you rights to use
+     any contributors' name, logo, or trademarks.
+
+     (B) If you bring a patent claim against any contributor over patents that
+     you claim are infringed by the software, your patent license from such
+     contributor to the software ends automatically.
+
+     (C) If you distribute any portion of the software, you must retain all
+     copyright, patent, trademark, and attribution notices that are present in
+     the software.
+
+     (D) If you distribute any portion of the software in source code form,
+     you may do so only under this license by including a complete copy of
+     this license with your distribution. If you distribute any portion of the
+     software in compiled or object code form, you may only do so under a
+     license that complies with this license.
+
+     (E) The software is licensed "as-is." You bear the risk of using it. The
+     contributors give no express warranties, guarantees, or conditions. You
+     may have additional consumer rights under your local laws which this
+     license cannot change. To the extent permitted under your local laws, the
+     contributors exclude the implied warranties of merchantability, fitness
+     for a particular purpose and non-infringement.
\ No newline at end of file
diff --git a/meta/README.md b/meta/README.md
new file mode 100644
index 0000000000..02b43e60f4
--- /dev/null
+++ b/meta/README.md
@@ -0,0 +1,37 @@
+# Prism Launcher Meta
+
+Scripts to generate jsons and jars that Prism Launcher will access.
+
+## Recommended Deployment
+
+Assuming you have a Flake-based NixOS configuration
+
+- Add Flake input:
+
+    ```nix
+    {
+      inputs.prism-meta.url = "github:PrismLauncher/meta";
+    }
+    ```
+
+- Import NixOS module and configure
+
+    ```nix
+    {inputs, ...}: {
+      imports = [inputs.prism-meta.nixosModules.default];
+      services.blockgame-meta = {
+        enable = true;
+        settings = {
+          DEPLOY_TO_GIT = "true";
+          GIT_AUTHOR_NAME = "Herpington Derpson";
+          GIT_AUTHOR_EMAIL = "herpderp@derpmail.com";
+          GIT_COMMITTER_NAME = "Herpington Derpson";
+          GIT_COMMITTER_EMAIL = "herpderp@derpmail.com";
+        };
+      };
+    }
+    ```
+
+- Rebuild and activate!
+- Trigger it `systemctl start blockgame-meta.service`
+- Monitor it `journalctl -fu blockgame-meta.service`
diff --git a/meta/caches/forge_cache/.keep b/meta/caches/forge_cache/.keep
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/meta/caches/forge_cache/.keep
diff --git a/meta/caches/http_cache/.keep b/meta/caches/http_cache/.keep
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/meta/caches/http_cache/.keep
diff --git a/meta/config.example.sh b/meta/config.example.sh
new file mode 100644
index 0000000000..835059f3af
--- /dev/null
+++ b/meta/config.example.sh
@@ -0,0 +1,13 @@
+export META_UPSTREAM_DIR=upstream
+export META_LAUNCHER_DIR=launcher
+export DEPLOY_TO_FOLDER=false
+export DEPLOY_FOLDER=/app/public/v1
+export DEPLOY_FOLDER_USER=http
+export DEPLOY_FOLDER_GROUP=http
+
+export DEPLOY_TO_GIT=true
+export GIT_AUTHOR_NAME="Herpington Derpson"
+export GIT_AUTHOR_EMAIL="herpderp@derpmail.com"
+export GIT_COMMITTER_NAME="$GIT_AUTHOR_NAME"
+export GIT_COMMITTER_EMAIL="$GIT_AUTHOR_EMAIL"
+export GIT_SSH_COMMAND="ssh -i ${BASEDIR}/config/deploy.key"
diff --git a/meta/flake.lock b/meta/flake.lock
new file mode 100644
index 0000000000..6d54022b39
--- /dev/null
+++ b/meta/flake.lock
@@ -0,0 +1,92 @@
+{
+  "nodes": {
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1751413152,
+        "narHash": "sha256-Tyw1RjYEsp5scoigs1384gIg6e0GoBVjms4aXFfRssQ=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "77826244401ea9de6e3bac47c2db46005e1f30b5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "git-hooks": {
+      "inputs": {
+        "flake-compat": [],
+        "gitignore": "gitignore",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1750779888,
+        "narHash": "sha256-wibppH3g/E2lxU43ZQHC5yA/7kIKLGxVEnsnVK1BtRg=",
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "rev": "16ec914f6fb6f599ce988427d9d94efddf25fe6d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "git-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1709087332,
+        "narHash": "sha256-HG2cCnktfHsKV0s4XW83gU3F57gaTljL9KNSuG6bnQs=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1751382304,
+        "narHash": "sha256-p+UruOjULI5lV16FkBqkzqgFasLqfx0bihLBeFHiZAs=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "d31a91c9b3bee464d054633d5f8b84e17a637862",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-parts": "flake-parts",
+        "git-hooks": "git-hooks",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/meta/flake.nix b/meta/flake.nix
new file mode 100644
index 0000000000..aaacaa58e5
--- /dev/null
+++ b/meta/flake.nix
@@ -0,0 +1,35 @@
+{
+  description = "Prism Launcher Metadata generation scripts";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    flake-parts = {
+      url = "github:hercules-ci/flake-parts";
+      inputs.nixpkgs-lib.follows = "nixpkgs";
+    };
+    git-hooks = {
+      url = "github:cachix/git-hooks.nix";
+      inputs.flake-compat.follows = "";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = inputs:
+    inputs.flake-parts.lib.mkFlake
+    {inherit inputs;}
+    {
+      imports = [
+        inputs.git-hooks.flakeModule
+
+        ./nix/dev.nix
+        ./nix/nixos
+        ./nix/packages.nix
+      ];
+
+      # Supported systems.
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux"
+      ];
+    };
+}
diff --git a/meta/garnix.yaml b/meta/garnix.yaml
new file mode 100644
index 0000000000..312815da5d
--- /dev/null
+++ b/meta/garnix.yaml
@@ -0,0 +1,5 @@
+builds:
+  include:
+    - "checks.x86_64-linux.*"
+    - "devShells.*.*"
+    - "packages.*.*"
diff --git a/meta/init.sh b/meta/init.sh
new file mode 100644
index 0000000000..c9bfa8133f
--- /dev/null
+++ b/meta/init.sh
@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+set -ex
+
+if [ -f config.sh ]; then
+    source config.sh
+fi
+
+export META_CACHE_DIR=${CACHE_DIRECTORY:-./caches}
+export META_UPSTREAM_DIR=${META_UPSTREAM_DIR:-${STATE_DIRECTORY:-.}/upstream}
+export META_LAUNCHER_DIR=${META_LAUNCHER_DIR:-${STATE_DIRECTORY:-.}/launcher}
+
+function init_repo {
+    # no op if target already exists
+    if [ -d "$1" ]; then
+        return 0
+    fi
+
+    # fail if no repo url is specified
+    if [ -z "$2" ]; then
+        echo "Can't initialize missing $1 directory. Please specify $3" >&2
+        return 1
+    fi
+
+    git clone "$2" "$1"
+}
+
+init_repo "$META_UPSTREAM_DIR" "$META_UPSTREAM_URL" "META_UPSTREAM_URL"
+init_repo "$META_LAUNCHER_DIR" "$META_LAUNCHER_URL" "META_LAUNCHER_URL"
diff --git a/meta/meta/__init__.py b/meta/meta/__init__.py
new file mode 100644
index 0000000000..05cee3e7d7
--- /dev/null
+++ b/meta/meta/__init__.py
@@ -0,0 +1 @@
+"""Meta package of meta"""
diff --git a/meta/meta/common/__init__.py b/meta/meta/common/__init__.py
new file mode 100644
index 0000000000..04e3bdfbb0
--- /dev/null
+++ b/meta/meta/common/__init__.py
@@ -0,0 +1,125 @@
+import os
+import os.path
+import datetime
+import hashlib
+import sys
+from urllib.parse import urlparse
+from typing import Any, Optional, Callable
+
+import requests
+from cachecontrol import CacheControl  # type: ignore
+from cachecontrol.caches import FileCache  # type: ignore
+
+LAUNCHER_MAVEN = "https://files.prismlauncher.org/maven/%s"
+
+
+def serialize_datetime(dt: datetime.datetime):
+    if dt.tzinfo is None:
+        return dt.replace(tzinfo=datetime.timezone.utc).isoformat()
+
+    return dt.isoformat()
+
+
+def cache_path():
+    if "META_CACHE_DIR" in os.environ:
+        return os.environ["META_CACHE_DIR"]
+    return "cache"
+
+
+def launcher_path():
+    if "META_LAUNCHER_DIR" in os.environ:
+        return os.environ["META_LAUNCHER_DIR"]
+    return "launcher"
+
+
+def upstream_path():
+    if "META_UPSTREAM_DIR" in os.environ:
+        return os.environ["META_UPSTREAM_DIR"]
+    return "upstream"
+
+
+def ensure_upstream_dir(path):
+    path = os.path.join(upstream_path(), path)
+    if not os.path.exists(path):
+        os.makedirs(path)
+
+
+def ensure_component_dir(component_id: str):
+    path = os.path.join(launcher_path(), component_id)
+    if not os.path.exists(path):
+        os.makedirs(path)
+
+
+def transform_maven_key(maven_key: str):
+    return maven_key.replace(":", ".")
+
+
+def replace_old_launchermeta_url(url: str):
+    o = urlparse(url)
+    if o.netloc == "launchermeta.mojang.com":
+        return o._replace(netloc="piston-meta.mojang.com").geturl()
+
+    return url
+
+
+def get_all_bases(cls: type, bases: Optional[list[type]] = None):
+    bases = bases or []
+    bases.append(cls)
+    for c in cls.__bases__:
+        get_all_bases(c, bases)
+    return tuple(bases)
+
+
+def merge_dict(base: dict[Any, Any], overlay: dict[Any, Any]):
+    for k, v in base.items():
+        if isinstance(v, dict):
+            merge_dict(v, overlay.setdefault(k, {}))  # type: ignore
+        else:
+            if k not in overlay:
+                overlay[k] = v
+
+    return overlay
+
+
+def default_session():
+    cache = FileCache(os.path.join(cache_path(), "http_cache"))
+    sess = CacheControl(requests.Session(), cache)
+
+    sess.headers.update({"User-Agent": "PrismLauncherMeta/1.0"})
+
+    return sess
+
+
+def remove_files(file_paths: list[str]) -> None:
+    for file_path in file_paths:
+        try:
+            if os.path.isfile(file_path):
+                os.remove(file_path)
+        except Exception as e:
+            print(e)
+
+
+def eprint(*args, **kwargs):
+    print(*args, file=sys.stderr, **kwargs)
+
+
+def file_hash(
+    filename: str, hashtype: Callable[[], "hashlib._Hash"], blocksize: int = 65536
+) -> str:
+    hashtype = hashtype()
+    with open(filename, "rb") as f:
+        for block in iter(lambda: f.read(blocksize), b""):
+            hashtype.update(block)
+    return hashtype.hexdigest()
+
+
+def get_file_sha1_from_file(file_name: str, sha1_file: str) -> Optional[str]:
+    if os.path.isfile(sha1_file):
+        with open(sha1_file, "r") as file:
+            return file.read()
+    if not os.path.isfile(file_name):
+        return None
+    new_sha1 = file_hash(file_name, hashlib.sha1)
+    with open(sha1_file, "w") as file:
+        file.write(new_sha1)
+    return None
diff --git a/meta/meta/common/fabric.py b/meta/meta/common/fabric.py
new file mode 100644
index 0000000000..2a35695cf1
--- /dev/null
+++ b/meta/meta/common/fabric.py
@@ -0,0 +1,12 @@
+from os.path import join
+
+BASE_DIR = "fabric"
+
+JARS_DIR = join(BASE_DIR, "jars")
+INSTALLER_INFO_DIR = join(BASE_DIR, "loader-installer-json")
+META_DIR = join(BASE_DIR, "meta-v2")
+
+LOADER_COMPONENT = "net.fabricmc.fabric-loader"
+INTERMEDIARY_COMPONENT = "net.fabricmc.intermediary"
+
+DATETIME_FORMAT_HTTP = "%a, %d %b %Y %H:%M:%S %Z"
diff --git a/meta/meta/common/forge.py b/meta/meta/common/forge.py
new file mode 100644
index 0000000000..3cf5c3d10f
--- /dev/null
+++ b/meta/meta/common/forge.py
@@ -0,0 +1,22 @@
+from os.path import join, dirname
+
+from ..model import GradleSpecifier, make_launcher_library
+
+BASE_DIR = "forge"
+
+JARS_DIR = join(BASE_DIR, "jars")
+INSTALLER_INFO_DIR = join(BASE_DIR, "installer_info")
+INSTALLER_MANIFEST_DIR = join(BASE_DIR, "installer_manifests")
+VERSION_MANIFEST_DIR = join(BASE_DIR, "version_manifests")
+FILE_MANIFEST_DIR = join(BASE_DIR, "files_manifests")
+DERIVED_INDEX_FILE = join(BASE_DIR, "derived_index.json")
+LEGACYINFO_FILE = join(BASE_DIR, "legacyinfo.json")
+
+FORGE_COMPONENT = "net.minecraftforge"
+
+FORGEWRAPPER_LIBRARY = make_launcher_library(
+    GradleSpecifier("io.github.zekerzhayard", "ForgeWrapper", "prism-2025-12-07"),
+    "4c4653d80409e7e968d3e3209196ffae778b7b4e",
+    29731,
+)
+BAD_VERSIONS = ["1.12.2-14.23.5.2851"]
diff --git a/meta/meta/common/http.py b/meta/meta/common/http.py
new file mode 100644
index 0000000000..20f9d0d135
--- /dev/null
+++ b/meta/meta/common/http.py
@@ -0,0 +1,6 @@
+def download_binary_file(sess, path, url):
+    with open(path, "wb") as f:
+        r = sess.get(url)
+        r.raise_for_status()
+        for chunk in r.iter_content(chunk_size=128):
+            f.write(chunk)
diff --git a/meta/meta/common/java.py b/meta/meta/common/java.py
new file mode 100644
index 0000000000..8b83f65aa0
--- /dev/null
+++ b/meta/meta/common/java.py
@@ -0,0 +1,17 @@
+from os.path import join
+
+BASE_DIR = "java_runtime"
+
+RELEASE_FILE = join(BASE_DIR, "releases.json")
+ADOPTIUM_DIR = join(BASE_DIR, "adoptium")
+OPENJ9_DIR = join(BASE_DIR, "ibm")
+AZUL_DIR = join(BASE_DIR, "azul")
+
+ADOPTIUM_VERSIONS_DIR = join(ADOPTIUM_DIR, "versions")
+OPENJ9_VERSIONS_DIR = join(OPENJ9_DIR, "versions")
+AZUL_VERSIONS_DIR = join(AZUL_DIR, "versions")
+
+JAVA_MINECRAFT_COMPONENT = "net.minecraft.java"
+JAVA_ADOPTIUM_COMPONENT = "net.adoptium.java"
+JAVA_OPENJ9_COMPONENT = "com.ibm.java"
+JAVA_AZUL_COMPONENT = "com.azul.java"
diff --git a/meta/meta/common/liteloader.py b/meta/meta/common/liteloader.py
new file mode 100644
index 0000000000..7a6c19eb46
--- /dev/null
+++ b/meta/meta/common/liteloader.py
@@ -0,0 +1,7 @@
+from os.path import join
+
+BASE_DIR = "liteloader"
+
+VERSIONS_FILE = join(BASE_DIR, "versions.json")
+
+LITELOADER_COMPONENT = "com.mumfrey.liteloader"
diff --git a/meta/meta/common/mojang-library-patches.json b/meta/meta/common/mojang-library-patches.json
new file mode 100644
index 0000000000..d6386746b6
--- /dev/null
+++ b/meta/meta/common/mojang-library-patches.json
@@ -0,0 +1,4269 @@
+[
+  {
+    "_comment": "Only allow osx-arm64 for existing LWJGL 3.3.2/3.3.3/3.3.6",
+    "match": [
+      "org.lwjgl:lwjgl-freetype-natives-macos-arm64:3.3.2",
+      "org.lwjgl:lwjgl-glfw-natives-macos-arm64:3.3.2",
+      "org.lwjgl:lwjgl-jemalloc-natives-macos-arm64:3.3.2",
+      "org.lwjgl:lwjgl-openal-natives-macos-arm64:3.3.2",
+      "org.lwjgl:lwjgl-opengl-natives-macos-arm64:3.3.2",
+      "org.lwjgl:lwjgl-stb-natives-macos-arm64:3.3.2",
+      "org.lwjgl:lwjgl-tinyfd-natives-macos-arm64:3.3.2",
+      "org.lwjgl:lwjgl-natives-macos-arm64:3.3.2",
+      "org.lwjgl:lwjgl-freetype-natives-macos-arm64:3.3.3",
+      "org.lwjgl:lwjgl-glfw-natives-macos-arm64:3.3.3",
+      "org.lwjgl:lwjgl-jemalloc-natives-macos-arm64:3.3.3",
+      "org.lwjgl:lwjgl-openal-natives-macos-arm64:3.3.3",
+      "org.lwjgl:lwjgl-opengl-natives-macos-arm64:3.3.3",
+      "org.lwjgl:lwjgl-stb-natives-macos-arm64:3.3.3",
+      "org.lwjgl:lwjgl-tinyfd-natives-macos-arm64:3.3.3",
+      "org.lwjgl:lwjgl-natives-macos-arm64:3.3.3",
+      "org.lwjgl:lwjgl-freetype-natives-macos-arm64:3.3.6",
+      "org.lwjgl:lwjgl-glfw-natives-macos-arm64:3.3.6",
+      "org.lwjgl:lwjgl-jemalloc-natives-macos-arm64:3.3.6",
+      "org.lwjgl:lwjgl-openal-natives-macos-arm64:3.3.6",
+      "org.lwjgl:lwjgl-opengl-natives-macos-arm64:3.3.6",
+      "org.lwjgl:lwjgl-stb-natives-macos-arm64:3.3.6",
+      "org.lwjgl:lwjgl-tinyfd-natives-macos-arm64:3.3.6",
+      "org.lwjgl:lwjgl-natives-macos-arm64:3.3.6",
+      "org.lwjgl:lwjgl-freetype-natives-macos-arm64:3.4.1",
+      "org.lwjgl:lwjgl-glfw-natives-macos-arm64:3.4.1",
+      "org.lwjgl:lwjgl-jemalloc-natives-macos-arm64:3.4.1",
+      "org.lwjgl:lwjgl-openal-natives-macos-arm64:3.4.1",
+      "org.lwjgl:lwjgl-opengl-natives-macos-arm64:3.4.1",
+      "org.lwjgl:lwjgl-stb-natives-macos-arm64:3.4.1",
+      "org.lwjgl:lwjgl-tinyfd-natives-macos-arm64:3.4.1",
+      "org.lwjgl:lwjgl-natives-macos-arm64:3.4.1"
+    ],
+    "override": {
+      "rules": [
+        {
+          "action": "allow",
+          "os": {
+            "name": "osx-arm64"
+          }
+        }
+      ]
+    }
+  },
+  {
+    "_comment": "Only allow windows-arm64 for existing LWJGL 3.3.2/3.3.3/3.3.6",
+    "match": [
+      "org.lwjgl:lwjgl-freetype-natives-windows-arm64:3.3.2",
+      "org.lwjgl:lwjgl-glfw-natives-windows-arm64:3.3.2",
+      "org.lwjgl:lwjgl-jemalloc-natives-windows-arm64:3.3.2",
+      "org.lwjgl:lwjgl-openal-natives-windows-arm64:3.3.2",
+      "org.lwjgl:lwjgl-opengl-natives-windows-arm64:3.3.2",
+      "org.lwjgl:lwjgl-stb-natives-windows-arm64:3.3.2",
+      "org.lwjgl:lwjgl-tinyfd-natives-windows-arm64:3.3.2",
+      "org.lwjgl:lwjgl-natives-windows-arm64:3.3.2",
+      "org.lwjgl:lwjgl-freetype-natives-windows-arm64:3.3.3",
+      "org.lwjgl:lwjgl-glfw-natives-windows-arm64:3.3.3",
+      "org.lwjgl:lwjgl-jemalloc-natives-windows-arm64:3.3.3",
+      "org.lwjgl:lwjgl-openal-natives-windows-arm64:3.3.3",
+      "org.lwjgl:lwjgl-opengl-natives-windows-arm64:3.3.3",
+      "org.lwjgl:lwjgl-stb-natives-windows-arm64:3.3.3",
+      "org.lwjgl:lwjgl-tinyfd-natives-windows-arm64:3.3.3",
+      "org.lwjgl:lwjgl-natives-windows-arm64:3.3.3",
+      "org.lwjgl:lwjgl-freetype-natives-windows-arm64:3.3.6",
+      "org.lwjgl:lwjgl-glfw-natives-windows-arm64:3.3.6",
+      "org.lwjgl:lwjgl-jemalloc-natives-windows-arm64:3.3.6",
+      "org.lwjgl:lwjgl-openal-natives-windows-arm64:3.3.6",
+      "org.lwjgl:lwjgl-opengl-natives-windows-arm64:3.3.6",
+      "org.lwjgl:lwjgl-stb-natives-windows-arm64:3.3.6",
+      "org.lwjgl:lwjgl-tinyfd-natives-windows-arm64:3.3.6",
+      "org.lwjgl:lwjgl-natives-windows-arm64:3.3.6",
+      "org.lwjgl:lwjgl-freetype-natives-windows-arm64:3.4.1",
+      "org.lwjgl:lwjgl-glfw-natives-windows-arm64:3.4.1",
+      "org.lwjgl:lwjgl-jemalloc-natives-windows-arm64:3.4.1",
+      "org.lwjgl:lwjgl-openal-natives-windows-arm64:3.4.1",
+      "org.lwjgl:lwjgl-opengl-natives-windows-arm64:3.4.1",
+      "org.lwjgl:lwjgl-stb-natives-windows-arm64:3.4.1",
+      "org.lwjgl:lwjgl-tinyfd-natives-windows-arm64:3.4.1",
+      "org.lwjgl:lwjgl-natives-windows-arm64:3.4.1"
+    ],
+    "override": {
+      "rules": [
+        {
+          "action": "allow",
+          "os": {
+            "name": "windows-arm64"
+          }
+        }
+      ]
+    }
+  },
+  {
+    "_comment": "Add missing tinyfd to the broken LWJGL 3.2.2 variant",
+    "match": [
+      "org.lwjgl:lwjgl:3.2.2"
+    ],
+    "additionalLibraries": [
+      {
+        "downloads": {
+          "artifact": {
+            "sha1": "fcbe606c8f8da6f8f9a05e2c540eb1ee8632b0e9",
+            "size": 7092,
+            "url": "https://libraries.minecraft.net/org/lwjgl/lwjgl-tinyfd/3.2.2/lwjgl-tinyfd-3.2.2.jar"
+          }
+        },
+        "name": "org.lwjgl:lwjgl-tinyfd:3.2.2"
+      },
+      {
+        "downloads": {
+          "artifact": {
+            "sha1": "fcbe606c8f8da6f8f9a05e2c540eb1ee8632b0e9",
+            "size": 7092,
+            "url": "https://libraries.minecraft.net/org/lwjgl/lwjgl-tinyfd/3.2.2/lwjgl-tinyfd-3.2.2.jar"
+          },
+          "classifiers": {
+            "natives-linux": {
+              "sha1": "39e35b161c130635d9c8918ce04e887a30c5b687",
+              "size": 38804,
+              "url": "https://libraries.minecraft.net/org/lwjgl/lwjgl-tinyfd/3.2.2/lwjgl-tinyfd-3.2.2-natives-linux.jar"
+            },
+            "natives-macos": {
+              "sha1": "46d0798228b8a28e857a2a0f02310fd6ba2a4eab",
+              "size": 42136,
+              "url": "https://libraries.minecraft.net/org/lwjgl/lwjgl-tinyfd/3.2.2/lwjgl-tinyfd-3.2.2-natives-macos.jar"
+            },
+            "natives-windows": {
+              "sha1": "e9115958773644e863332a6a06488d26f9e1fc9f",
+              "size": 208314,
+              "url": "https://libraries.minecraft.net/org/lwjgl/lwjgl-tinyfd/3.2.2/lwjgl-tinyfd-3.2.2-natives-windows.jar"
+            }
+          }
+        },
+        "name": "org.lwjgl:lwjgl-tinyfd:3.2.2",
+        "natives": {
+          "linux": "natives-linux",
+          "osx": "natives-macos",
+          "windows": "natives-windows"
+        }
+      }
+    ],
+    "patchAdditionalLibraries": true
+  },
+  {
+    "_comment": "Add additional library just for osx-arm64. No override needed",
+    "match": [
+      "ca.weblite:java-objc-bridge:1.0.0"
+    ],
+    "additionalLibraries": [
+      {
+        "downloads": {
+          "artifact": {
+            "sha1": "369a83621e3c65496348491e533cb97fe5f2f37d",
+            "size": 91947,
+            "url": "https://github.com/MinecraftMachina/Java-Objective-C-Bridge/releases/download/1.1.0-mmachina.1/java-objc-bridge-1.1.jar"
+          }
+        },
+        "name": "ca.weblite:java-objc-bridge:1.1.0-mmachina.1",
+        "rules": [
+          {
+            "action": "allow",
+            "os": {
+              "name": "osx-arm64"
+            }
+          }
+        ]
+      }
+    ]
+  },
+  {
+    "_comment": "Add additional classifiers for jinput-platform",
+    "match": [
+      "net.java.jinput:jinput-platform:2.0.5"
+    ],
+    "override": {
+      "downloads": {
+        "classifiers": {
+          "natives-osx-arm64": {
+            "sha1": "5189eb40db3087fb11ca063b68fa4f4c20b199dd",
+            "size": 10031,
+            "url": "https://github.com/r58Playz/jinput-m1/raw/main/plugins/OSX/bin/jinput-platform-2.0.5.jar"
+          },
+          "natives-linux-arm64": {
+            "sha1": "42b388ccb7c63cec4e9f24f4dddef33325f8b212",
+            "size": 10932,
+            "url": "https://github.com/theofficialgman/lwjgl3-binaries-arm64/raw/lwjgl-2.9.4/jinput-platform-2.0.5-natives-linux.jar"
+          },
+          "natives-linux-arm32": {
+            "sha1": "f3c455b71c5146acb5f8a9513247fc06db182fd5",
+            "size": 4521,
+            "url": "https://github.com/theofficialgman/lwjgl3-binaries-arm32/raw/lwjgl-2.9.4/jinput-platform-2.0.5-natives-linux.jar"
+          }
+        }
+      },
+      "natives": {
+        "linux-arm64": "natives-linux-arm64",
+        "linux-arm32": "natives-linux-arm32",
+        "osx-arm64": "natives-osx-arm64"
+      }
+    }
+  },
+  {
+    "_comment": "Use a newer version on osx-arm64",
+    "match": [
+      "com.mojang:text2speech:1.0.10",
+      "com.mojang:text2speech:1.5",
+      "com.mojang:text2speech:1.6",
+      "com.mojang:text2speech:1.7",
+      "com.mojang:text2speech:1.10.1",
+      "com.mojang:text2speech:1.10.3",
+      "com.mojang:text2speech:1.11.2"
+    ],
+    "override": {
+      "rules": [
+        {
+          "action": "allow"
+        },
+        {
+          "action": "disallow",
+          "os": {
+            "name": "osx-arm64"
+          }
+        }
+      ]
+    },
+    "additionalLibraries": [
+      {
+        "downloads": {
+          "artifact": {
+            "sha1": "f378f889797edd7df8d32272c06ca80a1b6b0f58",
+            "size": 13164,
+            "url": "https://libraries.minecraft.net/com/mojang/text2speech/1.11.3/text2speech-1.11.3.jar"
+          }
+        },
+        "name": "com.mojang:text2speech:1.11.3",
+        "rules": [
+          {
+            "action": "allow",
+            "os": {
+              "name": "osx-arm64"
+            }
+          }
+        ]
+      }
+    ]
+  },
+  {
+    "_comment": "Use a newer version on osx-arm64, linux-arm64, and linux-arm32",
+    "match": [
+      "org.lwjgl.lwjgl:lwjgl:2.9.3",
+      "org.lwjgl.lwjgl:lwjgl:2.9.1-nightly-20131120",
+      "org.lwjgl.lwjgl:lwjgl:2.9.1-nightly-20131017",
+      "org.lwjgl.lwjgl:lwjgl:2.9.1-nightly-20130708-debug3",
+      "org.lwjgl.lwjgl:lwjgl:2.9.1"
+    ],
+    "override": {
+      "rules": [
+        {
+          "action": "allow"
+        },
+        {
+          "action": "disallow",
+          "os": {
+            "name": "osx-arm64"
+          }
+        },
+        {
+          "action": "disallow",
+          "os": {
+            "name": "linux-arm64"
+          }
+        },
+        {
+          "action": "disallow",
+          "os": {
+            "name": "linux-arm32"
+          }
+        }
+      ]
+    },
+    "additionalLibraries": [
+      {
+        "downloads": {
+          "artifact": {
+            "sha1": "697517568c68e78ae0b4544145af031c81082dfe",
+            "size": 1047168,
+            "url": "https://libraries.minecraft.net/org/lwjgl/lwjgl/lwjgl/2.9.4-nightly-20150209/lwjgl-2.9.4-nightly-20150209.jar"
+          }
+        },
+        "name": "org.lwjgl.lwjgl:lwjgl:2.9.4-nightly-20150209",
+        "rules": [
+          {
+            "action": "allow",
+            "os": {
+              "name": "osx-arm64"
+            }
+          },
+          {
+            "action": "allow",
+            "os": {
+              "name": "linux-arm64"
+            }
+          },
+          {
+            "action": "allow",
+            "os": {
+              "name": "linux-arm32"
+            }
+          }
+        ]
+      }
+    ]
+  },
+  {
+    "_comment": "Use a newer version on osx-arm64, linux-arm64, and linux-arm32",
+    "match": [
+      "org.lwjgl.lwjgl:lwjgl_util:2.9.3",
+      "org.lwjgl.lwjgl:lwjgl_util:2.9.1-nightly-20131120",
+      "org.lwjgl.lwjgl:lwjgl_util:2.9.1-nightly-20131017",
+      "org.lwjgl.lwjgl:lwjgl_util:2.9.1-nightly-20130708-debug3",
+      "org.lwjgl.lwjgl:lwjgl_util:2.9.1"
+    ],
+    "override": {
+      "rules": [
+        {
+          "action": "allow"
+        },
+        {
+          "action": "disallow",
+          "os": {
+            "name": "osx-arm64"
+          }
+        },
+        {
+          "action": "disallow",
+          "os": {
+            "name": "linux-arm64"
+          }
+        },
+        {
+          "action": "disallow",
+          "os": {
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+      ]
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+        "downloads": {
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+            "url": "https://libraries.minecraft.net/org/lwjgl/lwjgl/lwjgl_util/2.9.4-nightly-20150209/lwjgl_util-2.9.4-nightly-20150209.jar"
+          }
+        },
+        "name": "org.lwjgl.lwjgl:lwjgl_util:2.9.4-nightly-20150209",
+        "rules": [
+          {
+            "action": "allow",
+            "os": {
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+            }
+          },
+          {
+            "action": "allow",
+            "os": {
+              "name": "linux-arm64"
+            }
+          },
+          {
+            "action": "allow",
+            "os": {
+              "name": "linux-arm32"
+            }
+          }
+        ]
+      }
+    ]
+  },
+  {
+    "_comment": "Use a newer patched version on osx-arm64, linux-arm64, and linux-arm32",
+    "match": [
+      "org.lwjgl.lwjgl:lwjgl-platform:2.9.4-nightly-20150209",
+      "org.lwjgl.lwjgl:lwjgl-platform:2.9.3",
+      "org.lwjgl.lwjgl:lwjgl-platform:2.9.1-nightly-20131120",
+      "org.lwjgl.lwjgl:lwjgl-platform:2.9.1-nightly-20131017",
+      "org.lwjgl.lwjgl:lwjgl-platform:2.9.1-nightly-20130708-debug3",
+      "org.lwjgl.lwjgl:lwjgl-platform:2.9.1"
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+    "override": {
+      "downloads": {
+        "classifiers": {
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+            "size": 488316,
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+          },
+          "natives-linux-arm64": {
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+            "size": 579979,
+            "url": "https://github.com/theofficialgman/lwjgl3-binaries-arm64/raw/lwjgl-2.9.4/lwjgl-platform-2.9.4-nightly-20150209-natives-linux.jar"
+          },
+          "natives-linux-arm32": {
+            "sha1": "fa483e540a9a753a5ffbb23dcf7879a5bf752611",
+            "size": 475177,
+            "url": "https://github.com/theofficialgman/lwjgl3-binaries-arm32/raw/lwjgl-2.9.4/lwjgl-platform-2.9.4-nightly-20150209-natives-linux.jar"
+          }
+        }
+      },
+      "natives": {
+        "linux-arm64": "natives-linux-arm64",
+        "linux-arm32": "natives-linux-arm32",
+        "osx-arm64": "natives-osx-arm64"
+      }
+    }
+  },
+  {
+    "_comment": "Use a newer patched version on osx-arm64, linux-arm64, and linux-arm32",
+    "match": [
+      "org.lwjgl:lwjgl-glfw:3.2.2",
+      "org.lwjgl:lwjgl-glfw:3.2.1",
+      "org.lwjgl:lwjgl-glfw:3.1.6",
+      "org.lwjgl:lwjgl-glfw:3.1.2"
+    ],
+    "override": {
+      "rules": [
+        {
+          "action": "allow"
+        },
+        {
+          "action": "disallow",
+          "os": {
+            "name": "linux-arm64"
+          }
+        },
+        {
+          "action": "disallow",
+          "os": {
+            "name": "linux-arm32"
+          }
+        },
+        {
+          "action": "disallow",
+          "os": {
+            "name": "osx-arm64"
+          }
+        }
+      ]
+    },
+    "additionalLibraries": [
+      {
+        "downloads": {
+          "artifact": {
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+            "size": 108691,
+            "url": "https://github.com/theofficialgman/lwjgl3-binaries-arm64/raw/lwjgl-3.2.2/lwjgl-glfw.jar"
+          }
+        },
+        "name": "org.lwjgl:lwjgl-glfw:3.2.2-gman64.1",
+        "rules": [
+          {
+            "action": "allow",
+            "os": {
+              "name": "linux-arm64"
+            }
+          }
+        ]
+      },
+      {
+        "downloads": {
+          "artifact": {
+            "sha1": "155d175037efc76630940c197ca6dea2b17d7e18",
+            "size": 108691,
+            "url": "https://github.com/theofficialgman/lwjgl3-binaries-arm64/raw/lwjgl-3.2.2/lwjgl-glfw.jar"
+          },
+          "classifiers": {
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+              "size": 85072,
+              "url": "https://github.com/theofficialgman/lwjgl3-binaries-arm64/raw/lwjgl-3.2.2/lwjgl-glfw-natives-linux-arm64.jar"
+            }
+          }
+        },
+        "name": "org.lwjgl:lwjgl-glfw:3.2.2-gman64.1",
+        "natives": {
+          "linux-arm64": "natives-linux-arm64"
+        },
+        "rules": [
+          {
+            "action": "allow",
+            "os": {
+              "name": "linux-arm64"
+            }
+          }
+        ]
+      },
+      {
+        "downloads": {
+          "artifact": {
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+            "url": "https://github.com/theofficialgman/lwjgl3-binaries-arm32/raw/lwjgl-3.2.2/lwjgl-glfw.jar"
+          }
+        },
+        "name": "org.lwjgl:lwjgl-glfw:3.2.2-gman32.1",
+        "rules": [
+          {
+            "action": "allow",
+            "os": {
+              "name": "linux-arm32"
+            }
+          }
+        ]
+      },
+      {
+        "downloads": {
+          "artifact": {
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+            "url": "https://github.com/theofficialgman/lwjgl3-binaries-arm32/raw/lwjgl-3.2.2/lwjgl-glfw.jar"
+          },
+          "classifiers": {
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+              "size": 80186,
+              "url": "https://github.com/theofficialgman/lwjgl3-binaries-arm32/raw/lwjgl-3.2.2/lwjgl-glfw-natives-linux-arm32.jar"
+            }
+          }
+        },
+        "name": "org.lwjgl:lwjgl-glfw:3.2.2-gman32.1",
+        "natives": {
+          "linux-arm32": "natives-linux-arm32"
+        },
+        "rules": [
+          {
+            "action": "allow",
+            "os": {
+              "name": "linux-arm32"
+            }
+          }
+        ]
+      },
+      {
+        "downloads": {
+          "artifact": {
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+            "size": 130128,
+            "url": "https://github.com/MinecraftMachina/lwjgl3/releases/download/3.3.1-mmachina.1/lwjgl-glfw.jar"
+          }
+        },
+        "name": "org.lwjgl:lwjgl-glfw:3.3.1-mmachina.1",
+        "rules": [
+          {
+            "action": "allow",
+            "os": {
+              "name": "osx-arm64"
+            }
+          }
+        ]
+      },
+      {
+        "downloads": {
+          "artifact": {
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+            "url": "https://github.com/MinecraftMachina/lwjgl3/releases/download/3.3.1-mmachina.1/lwjgl-glfw.jar"
+          },
+          "classifiers": {
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+          }
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+      }
+    ]
+  },  
+  {
+    "_comment": "Replace glfw from 3.3.1 with version from 3.3.2 to prevent stack smashing",
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+      "name": "org.lwjgl:lwjgl-glfw-natives-linux:3.3.2-lwjgl.1"
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+  },
+  {
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+    "match": [
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+      "net.java.dev.jna:jna:5.8.0",
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+            "os": {
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+    ]
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+  {
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+    "match": [
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+      "net.java.dev.jna:jna-platform:5.8.0",
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+      "net.java.dev.jna:jna-platform:5.10.0",
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+            "url": "https://libraries.minecraft.net/net/java/dev/jna/jna-platform/5.13.0/jna-platform-5.13.0.jar"
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+        },
+        "name": "net.java.dev.jna:jna-platform:5.13.0",
+        "rules": [
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+            "os": {
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+          {
+            "action": "allow",
+            "os": {
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+            }
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+      }
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+]
diff --git a/meta/meta/common/mojang-minecraft-experiments.json b/meta/meta/common/mojang-minecraft-experiments.json
new file mode 100644
index 0000000000..2a6792a7b0
--- /dev/null
+++ b/meta/meta/common/mojang-minecraft-experiments.json
@@ -0,0 +1,159 @@
+{
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+      "wiki": "https://minecraft.wiki/w/Java_Edition_1.21.11_Release_Candidate_3",
+      "url": "https://piston-data.mojang.com/v1/objects/7abe399a1b3c07754c5dc3ec4e5c6f50ee03c10e/1_21_11-rc3_unobfuscated.zip"
+    },
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+      "wiki": "https://minecraft.wiki/w/Java_Edition_1.21.11_Release_Candidate_2",
+      "url": "https://piston-data.mojang.com/v1/objects/fb70de3ae3e19825622b7687d2fd783d78c4b05f/1_21_11-rc2_unobfuscated.zip"
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+      "wiki": "https://minecraft.wiki/w/Java_Edition_1.21.11_Release_Candidate_1",
+      "url": "https://piston-data.mojang.com/v1/objects/38712002b9d02061e662b69c44753a47d24da516/1_21_11-rc1_unobfuscated.zip"
+    },
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+      "wiki": "https://minecraft.wiki/w/Java_Edition_1.21.11_Pre-Release_5",
+      "url": "https://piston-data.mojang.com/v1/objects/931df659128f913ce356d6036c318c5d9a039e85/1_21_11-pre5_unobfuscated.zip"
+    },
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+      "id": "1_21_11-pre4_unobfuscated",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_1.21.11_Pre-Release_4",
+      "url": "https://piston-data.mojang.com/v1/objects/834666571f1e1374923b73f4baec4203d44e9c0d/1_21_11-pre4_unobfuscated.zip"
+    },
+    {
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+      "wiki": "https://minecraft.wiki/w/Java_Edition_1.21.11_Pre-Release_3",
+      "url": "https://piston-data.mojang.com/v1/objects/7717a481468cc33d2414d82ee9c0450f56264db0/1_21_11-pre3_unobfuscated.zip"
+    },
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+      "wiki": "https://minecraft.wiki/w/Java_Edition_1.21.11_Pre-Release_2",
+      "url": "https://piston-data.mojang.com/v1/objects/528731e05b7be26c90fedf8f2ef6470abb0d1994/1_21_11-pre2_unobfuscated.zip"
+    },
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+      "wiki": "https://minecraft.wiki/w/Java_Edition_1.21.11_Pre-Release_1",
+      "url": "https://piston-data.mojang.com/v1/objects/f98a0c053a8246cce12f8f29f2ba4ce00872fd53/1_21_11-pre1_unobfuscated.zip"
+    },
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+      "wiki": "https://minecraft.wiki/w/Java_Edition_25w46a",
+      "url": "https://piston-data.mojang.com/v1/objects/f9c5e4f9c1469296299635b498438e94d312f0c6/25w46a_unobfuscated.zip"
+    },
+    {
+      "id": "25w45a_unobfuscated",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_25w45a",
+      "url": "https://piston-data.mojang.com/v1/objects/de334d80d9ddc5abb94c611b8ad10f9125c4c421/25w45a_unobfuscated.zip"
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+      "wiki": "https://minecraft.wiki/w/Java_Edition_Deep_Dark_Experimental_Snapshot_1",
+      "url": "https://launcher.mojang.com/v1/objects/b1e589c1d6ed73519797214bc796e53f5429ac46/1_19_deep_dark_experimental_snapshot-1.zip"
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+    {
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+      "wiki": "https://minecraft.wiki/w/Java_Edition_1.18_Experimental_Snapshot_7",
+      "url": "https://launcher.mojang.com/v1/objects/ab4ecebb133f56dd4c4c4c3257f030a947ddea84/1_18_experimental-snapshot-7.zip"
+    },
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+      "wiki": "https://minecraft.wiki/w/Java_Edition_1.18_Experimental_Snapshot_6",
+      "url": "https://launcher.mojang.com/v1/objects/4697c84c6a347d0b8766759d5b00bc5a00b1b858/1_18_experimental-snapshot-6.zip"
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diff --git a/meta/meta/common/mojang-minecraft-legacy-override.json b/meta/meta/common/mojang-minecraft-legacy-override.json
new file mode 100644
index 0000000000..d1d951d05f
--- /dev/null
+++ b/meta/meta/common/mojang-minecraft-legacy-override.json
@@ -0,0 +1,585 @@
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+            "releaseTime": "2010-10-30T00:00:00+02:00",
+            "+traits": ["legacyLaunch", "no-texturepacks"]
+        },
+        "a1.1.2_01": {
+            "releaseTime": "2010-09-23T00:00:00+02:00",
+            "+traits": ["legacyLaunch", "no-texturepacks"],
+            "+jvmArgs": ["-Djava.util.Arrays.useLegacyMergeSort=true"]
+        },
+        "a1.1.2": {
+            "releaseTime": "2010-09-20T00:00:00+02:00",
+            "+traits": ["legacyLaunch", "no-texturepacks"],
+            "+jvmArgs": ["-Djava.util.Arrays.useLegacyMergeSort=true"]
+        },
+        "a1.1.0": {
+            "releaseTime": "2010-09-13T00:00:00+02:00",
+            "+traits": ["legacyLaunch", "no-texturepacks"],
+            "+jvmArgs": ["-Djava.util.Arrays.useLegacyMergeSort=true"]
+        },
+        "a1.0.17_04": {
+            "releaseTime": "2010-08-23T00:00:00+02:00",
+            "+traits": ["legacyLaunch", "no-texturepacks"],
+            "+jvmArgs": ["-Djava.util.Arrays.useLegacyMergeSort=true"]
+        },
+        "a1.0.17_02": {
+            "releaseTime": "2010-08-20T00:00:00+02:00",
+            "+traits": ["legacyLaunch", "no-texturepacks"],
+            "+jvmArgs": ["-Djava.util.Arrays.useLegacyMergeSort=true"]
+        },
+        "a1.0.16": {
+            "releaseTime": "2010-08-12T00:00:00+02:00",
+            "+traits": ["legacyLaunch", "no-texturepacks"],
+            "+jvmArgs": ["-Djava.util.Arrays.useLegacyMergeSort=true"]
+        },
+        "a1.0.15": {
+            "releaseTime": "2010-08-04T00:00:00+02:00",
+            "+traits": ["legacyLaunch", "no-texturepacks"],
+            "+jvmArgs": ["-Djava.util.Arrays.useLegacyMergeSort=true"]
+        },
+        "a1.0.14": {
+            "releaseTime": "2010-07-30T00:00:00+02:00",
+            "+traits": ["legacyLaunch", "no-texturepacks"],
+            "+jvmArgs": ["-Djava.util.Arrays.useLegacyMergeSort=true"]
+        },
+        "a1.0.11": {
+            "releaseTime": "2010-07-23T00:00:00+02:00",
+            "+traits": ["legacyLaunch", "no-texturepacks"],
+            "+jvmArgs": ["-Djava.util.Arrays.useLegacyMergeSort=true"]
+        },
+        "a1.0.5_01": {
+            "releaseTime": "2010-07-13T00:00:00+02:00",
+            "mainClass": "y",
+            "+traits": ["legacyLaunch", "no-texturepacks"],
+            "+jvmArgs": ["-Djava.util.Arrays.useLegacyMergeSort=true"]
+        },
+        "a1.0.4": {
+            "releaseTime": "2010-07-09T00:00:00+02:00",
+            "mainClass": "ax",
+            "+traits": ["legacyLaunch", "no-texturepacks"],
+            "+jvmArgs": ["-Djava.util.Arrays.useLegacyMergeSort=true"]
+        },
+        "inf-20100618": {
+            "releaseTime": "2010-06-16T00:00:00+02:00",
+            "mainClass": "net.minecraft.client.d",
+            "appletClass": "net.minecraft.client.MinecraftApplet",
+            "+traits": ["legacyLaunch", "no-texturepacks"],
+            "+jvmArgs": ["-Djava.util.Arrays.useLegacyMergeSort=true"]
+        },
+        "c0.30_01c": {
+            "releaseTime": "2009-12-22T00:00:00+02:00",
+            "mainClass": "com.mojang.minecraft.l",
+            "appletClass": "com.mojang.minecraft.MinecraftApplet",
+            "+traits": ["legacyLaunch", "no-texturepacks"]
+        },
+        "c0.0.13a_03": {
+            "releaseTime": "2009-05-22T00:00:00+02:00",
+            "mainClass": "com.mojang.minecraft.c",
+            "appletClass": "com.mojang.minecraft.MinecraftApplet",
+            "+traits": ["legacyLaunch", "no-texturepacks"]
+        },
+        "c0.0.13a": {
+            "releaseTime": "2009-05-31T00:00:00+02:00",
+            "mainClass": "com.mojang.minecraft.Minecraft",
+            "appletClass": "com.mojang.minecraft.MinecraftApplet",
+            "+traits": ["legacyLaunch", "no-texturepacks"]
+        },
+        "c0.0.11a": {
+            "releaseTime": "2009-05-17T00:00:00+02:00",
+            "mainClass": "com.mojang.minecraft.Minecraft",
+            "appletClass": "com.mojang.minecraft.MinecraftApplet",
+            "+traits": ["legacyLaunch", "no-texturepacks"]
+        },
+        "rd-161348": {
+            "releaseTime": "2009-05-16T13:48:00+02:00",
+            "mainClass": "com.mojang.minecraft.RubyDung",
+            "+traits": ["no-texturepacks"]
+        },
+        "rd-160052": {
+            "releaseTime": "2009-05-16T00:52:00+02:00",
+            "mainClass": "com.mojang.rubydung.RubyDung",
+            "+traits": ["no-texturepacks"]
+        },
+        "rd-20090515": {
+            "mainClass": "com.mojang.rubydung.RubyDung",
+            "+traits": ["no-texturepacks"]
+        },
+        "rd-132328": {
+            "releaseTime": "2009-05-13T23:28:00+02:00",
+            "mainClass": "com.mojang.rubydung.RubyDung",
+            "+traits": ["no-texturepacks"]
+        },
+        "rd-132211": {
+            "releaseTime": "2009-05-13T22:11:00+02:00",
+            "mainClass": "com.mojang.rubydung.RubyDung",
+            "+traits": ["no-texturepacks"]
+        }
+    }
+}
diff --git a/meta/meta/common/mojang-minecraft-legacy-services.json b/meta/meta/common/mojang-minecraft-legacy-services.json
new file mode 100644
index 0000000000..420d3f8c74
--- /dev/null
+++ b/meta/meta/common/mojang-minecraft-legacy-services.json
@@ -0,0 +1,218 @@
+[
+    "c0.30_01c",
+    "inf-20100618",
+    "a1.0.4",
+    "a1.0.5_01",
+    "a1.0.11",
+    "a1.0.14",
+    "a1.0.15",
+    "a1.0.16",
+    "a1.0.17_02",
+    "a1.0.17_04",
+    "a1.1.0",
+    "a1.1.2",
+    "a1.1.2_01",
+    "a1.2.0",
+    "a1.2.0_01",
+    "a1.2.0_02",
+    "a1.2.1",
+    "a1.2.1_01",
+    "a1.2.2a",
+    "a1.2.2b",
+    "a1.2.3",
+    "a1.2.3_01",
+    "a1.2.3_02",
+    "a1.2.3_04",
+    "a1.2.4_01",
+    "a1.2.5",
+    "a1.2.6",
+    "b1.0",
+    "b1.0_01",
+    "b1.0.2",
+    "b1.1_01",
+    "b1.1_02",
+    "b1.2",
+    "b1.2_01",
+    "b1.2_02",
+    "b1.3b",
+    "b1.3_01",
+    "b1.4",
+    "b1.4_01",
+    "b1.5",
+    "b1.5_01",
+    "b1.6",
+    "b1.6.1",
+    "b1.6.2",
+    "b1.6.3",
+    "b1.6.4",
+    "b1.6.5",
+    "b1.6.6",
+    "b1.7",
+    "b1.7.2",
+    "b1.7.3",
+    "b1.8-pre1-2",
+    "b1.8-pre2",
+    "b1.8",
+    "b1.8.1",
+    "b1.9-pre1",
+    "b1.9-pre2",
+    "b1.9-pre3",
+    "b1.9-pre4",
+    "b1.9-pre5",
+    "b1.9-pre6",
+    "1.0",
+    "11w47a",
+    "11w48a",
+    "11w49a",
+    "11w50a",
+    "12w01a",
+    "1.1",
+    "12w03a",
+    "12w04a",
+    "12w05a",
+    "12w05b",
+    "12w06a",
+    "12w07b",
+    "12w07a",
+    "12w08a",
+    "1.2",
+    "1.2.1",
+    "1.2.2",
+    "1.2.3",
+    "1.2.4",
+    "1.2.5",
+    "12w16a",
+    "12w17a",
+    "12w18a",
+    "12w19a",
+    "12w21a",
+    "12w21b",
+    "12w22a",
+    "12w23a",
+    "12w23b",
+    "12w24a",
+    "12w25a",
+    "12w26a",
+    "12w27a",
+    "12w30a",
+    "12w30b",
+    "12w30c",
+    "12w30d",
+    "12w30e",
+    "1.3",
+    "1.3.1",
+    "12w32a",
+    "1.3.2",
+    "12w34a",
+    "12w34b",
+    "12w36a",
+    "12w37a",
+    "12w38a",
+    "12w38b",
+    "12w39a",
+    "12w39b",
+    "12w40a",
+    "12w40b",
+    "12w41a",
+    "12w41b",
+    "12w42a",
+    "12w42b",
+    "1.4",
+    "1.4.1",
+    "1.4.2",
+    "1.4.3",
+    "1.4.4",
+    "1.4.5",
+    "12w49a",
+    "12w50a",
+    "12w50b",
+    "1.4.6",
+    "1.4.7",
+    "13w01a",
+    "13w01b",
+    "13w02a",
+    "13w02b",
+    "13w03a",
+    "13w04a",
+    "13w05a",
+    "13w05b",
+    "13w06a",
+    "13w07a",
+    "13w11a",
+    "13w09a",
+    "13w09b",
+    "13w09c",
+    "13w10a",
+    "13w10b",
+    "1.5",
+    "13w12~",
+    "1.5.1",
+    "1.5.2",
+    "13w17a",
+    "13w18a",
+    "13w18b",
+    "13w18c",
+    "13w19a",
+    "13w21a",
+    "13w21b",
+    "13w22a",
+    "13w23a",
+    "13w23b",
+    "13w24a",
+    "13w24b",
+    "13w25a",
+    "13w25b",
+    "13w25c",
+    "13w26a",
+    "1.6",
+    "1.6.1",
+    "1.6.2",
+    "13w36a",
+    "13w36b",
+    "13w37a",
+    "1.6.3",
+    "13w37b",
+    "1.6.4",
+    "13w38a",
+    "13w38b",
+    "13w38c",
+    "13w39a",
+    "13w39b",
+    "13w41a",
+    "13w41b",
+    "13w42a",
+    "13w42b",
+    "13w43a",
+    "1.7",
+    "1.7.1",
+    "1.7.2",
+    "13w47a",
+    "13w47b",
+    "13w47c",
+    "13w47d",
+    "13w47e",
+    "13w48a",
+    "13w48b",
+    "13w49a",
+    "1.7.3",
+    "1.7.4",
+    "14w02a",
+    "14w02b",
+    "14w02c",
+    "14w03a",
+    "14w03b",
+    "14w04a",
+    "14w04b",
+    "14w05a",
+    "14w05b",
+    "14w06a",
+    "14w06b",
+    "14w07a",
+    "1.7.5",
+    "14w08a",
+    "14w10b",
+    "14w10c",
+    "1.7.6-pre1",
+    "1.7.6-pre2",
+    "14w11a"
+]
diff --git a/meta/meta/common/mojang-minecraft-old-snapshots.json b/meta/meta/common/mojang-minecraft-old-snapshots.json
new file mode 100644
index 0000000000..24ee0ce8b8
--- /dev/null
+++ b/meta/meta/common/mojang-minecraft-old-snapshots.json
@@ -0,0 +1,604 @@
+{
+  "old_snapshots": [
+    {
+      "id": "1_2",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_1.2",
+      "url": "https://archive.org/download/Minecraft-JSONs/1.2.json",
+      "sha1": "a2064011425a5e5befd9dee5eeb4f968ddf5ac77",
+      "size": 3988919,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/1_2/minecraft.jar"
+    },
+    {
+      "id": "11w47a",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_11w47a",
+      "url": "https://archive.org/download/Minecraft-JSONs/11w47a.json",
+      "sha1": "4e327918708d22e7443fbadefb9831ca04af4b90",
+      "size": 2242242,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/11w47a/minecraft.jar"
+    },
+    {
+      "id": "11w48a",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_11w48a",
+      "url": "https://archive.org/download/Minecraft-JSONs/11w48a.json",
+      "sha1": "fede770abe88a19e844d99dda611a7d18184155a",
+      "size": 2242604,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/11w48a/minecraft.jar"
+    },
+    {
+      "id": "11w49a",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_11w49a",
+      "url": "https://archive.org/download/Minecraft-JSONs/11w49a.json",
+      "sha1": "6f92a726e6b8b64f66c7e4d236f983c278d5af54",
+      "size": 3510866,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/11w49a/minecraft.jar"
+    },
+    {
+      "id": "11w50a",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_11w50a",
+      "url": "https://archive.org/download/Minecraft-JSONs/11w50a.json",
+      "sha1": "f4981ba0fee00a16d8dc9ec87bf2c4fdb51e4b7c",
+      "size": 3509701,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/11w50a/minecraft.jar"
+    },
+    {
+      "id": "12w01a",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_12w01a",
+      "url": "https://archive.org/download/Minecraft-JSONs/12w01a.json",
+      "sha1": "653a9cf55884b6bc4dcf3c574331e04bd5ad1032",
+      "size": 3839447,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/12w01a/minecraft.jar"
+    },
+    {
+      "id": "12w03a",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_12w03a",
+      "url": "https://archive.org/download/Minecraft-JSONs/12w03a.json",
+      "sha1": "e581c7c9dd57cbf73f72b833be5eff6109187df0",
+      "size": 3875210,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/12w03a/minecraft.jar"
+    },
+    {
+      "id": "12w04a",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_12w04a",
+      "url": "https://archive.org/download/Minecraft-JSONs/12w04a.json",
+      "sha1": "4911c473e856ec8102b8419eb36d0f54dad029a0",
+      "size": 3911974,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/12w04a/minecraft.jar"
+    },
+    {
+      "id": "12w05a",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_12w05a",
+      "url": "https://archive.org/download/Minecraft-JSONs/12w05a.json",
+      "sha1": "28328e67b82564335aa8280095a0716a2eb790de",
+      "size": 3931639,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/12w05a/minecraft.jar"
+    },
+    {
+      "id": "12w05b",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_12w05b",
+      "url": "https://archive.org/download/Minecraft-JSONs/12w05b.json",
+      "sha1": "75fbc4a39a244d0f1eb842ff8385e992e2b47dd5",
+      "size": 3931694,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/12w05b/minecraft.jar"
+    },
+    {
+      "id": "12w06a",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_12w06a",
+      "url": "https://archive.org/download/Minecraft-JSONs/12w06a.json",
+      "sha1": "a8403c0d4c0cdb65722d864d9cf42663b8aab08b",
+      "size": 3934973,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/12w06a/minecraft.jar"
+    },
+    {
+      "id": "12w07a",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_12w07a",
+      "url": "https://archive.org/download/Minecraft-JSONs/12w07a.json",
+      "sha1": "e7ad115b29612b893972f0817030d993bc56fb7e",
+      "size": 3956252,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/12w07a/minecraft.jar"
+    },
+    {
+      "id": "12w07b",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_12w07b",
+      "url": "https://archive.org/download/Minecraft-JSONs/12w07b.json",
+      "sha1": "0eea35d588fc2cee5d397472aa3565f48c220217",
+      "size": 3956323,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/12w07b/minecraft.jar"
+    },
+    {
+      "id": "12w08a",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_12w08a",
+      "url": "https://archive.org/download/Minecraft-JSONs/12w08a.json",
+      "sha1": "db2fcfdd23526b0f381ef2f3f2fd049d36227230",
+      "size": 3981486,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/12w08a/minecraft.jar"
+    },
+    {
+      "id": "12w16a",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_12w16a",
+      "url": "https://archive.org/download/Minecraft-JSONs/12w16a.json",
+      "sha1": "6b0a9fe3ac275f79ac6d259f4279752274ec05f8",
+      "size": 4080437,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/12w16a/minecraft.jar"
+    },
+    {
+      "id": "12w17a",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_12w17a",
+      "url": "https://archive.org/download/Minecraft-JSONs/12w17a.json",
+      "sha1": "17d41f8a07e054040ba34e523593bdea7f0fb6ba",
+      "size": 4114768,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/12w17a/minecraft.jar"
+    },
+    {
+      "id": "12w18a",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_12w18a",
+      "url": "https://archive.org/download/Minecraft-JSONs/12w18a.json",
+      "sha1": "9e9ab992317048bee9158ad9d1e2bc758db2b4af",
+      "size": 4317820,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/12w18a/minecraft.zip/bin/minecraft.jar"
+    },
+    {
+      "id": "12w19a",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_12w19a",
+      "url": "https://archive.org/download/Minecraft-JSONs/12w19a.json",
+      "sha1": "474aaac9a8b1dcbf312a5c09c7eae4a6aa401225",
+      "size": 4343792,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/12w19a/minecraft.zip/bin/minecraft.jar"
+    },
+    {
+      "id": "12w21a",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_12w21a",
+      "url": "https://archive.org/download/Minecraft-JSONs/12w21a.json",
+      "sha1": "e755423a04b0efde01e035a9d651acadeba0aef9",
+      "size": 4409586,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/12w21a/minecraft.jar"
+    },
+    {
+      "id": "12w21b",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_12w21b",
+      "url": "https://archive.org/download/Minecraft-JSONs/12w21b.json",
+      "sha1": "84437ded4839b29d34f83e9f3bab07cc48980faf",
+      "size": 4499708,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/12w21b/minecraft.jar"
+    },
+    {
+      "id": "12w22a",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_12w22a",
+      "url": "https://archive.org/download/Minecraft-JSONs/12w22a.json",
+      "sha1": "3631a714cb465d39f5cb5c18aa23abf38031b359",
+      "size": 4542344,
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+      "wiki": "https://minecraft.wiki/w/Java_Edition_b1.8-pre2",
+      "url": "https://archive.org/download/Minecraft-JSONs/b1.8-pre2.json",
+      "sha1": "44191f2895bf1e064269c9279778f2e3e9c3c9c7",
+      "size": 1897780,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/1_8-pre2/minecraft.jar"
+    },
+    {
+      "id": "b1_9-pre1",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_b1.9-pre1",
+      "url": "https://archive.org/download/Minecraft-JSONs/b1.9-pre1.json",
+      "sha1": "fdeef0129af130aa00702e53c37c5c4029b7d50e",
+      "size": 1966908,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/1_9-pre/minecraft.jar"
+    },
+    {
+      "id": "b1_9-pre2",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_b1.9-pre2",
+      "url": "https://archive.org/download/Minecraft-JSONs/b1.9-pre2.json",
+      "sha1": "b0d40cf43b625631af65e2a645c34b533251da0e",
+      "size": 1988123,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/1_9-pre2/minecraft.jar"
+    },
+    {
+      "id": "b1_9-pre3",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_b1.9-pre3",
+      "url": "https://archive.org/download/Minecraft-JSONs/b1.9-pre3.json",
+      "sha1": "5b7fe76a602b7511c97740e36dc25040ccb6e76b",
+      "size": 2087104,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/1_9-pre3/minecraft.jar"
+    },
+    {
+      "id": "b1_9-pre4",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_b1.9-pre4",
+      "url": "https://archive.org/download/Minecraft-JSONs/b1.9-pre4.json",
+      "sha1": "5c4831d9705f2e00e3cd993e89b822636492932a",
+      "size": 2147107,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/1_9-pre4/minecraft.jar"
+    },
+    {
+      "id": "b1_9-pre5",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_b1.9-pre5",
+      "url": "https://archive.org/download/Minecraft-JSONs/b1.9-pre5.json",
+      "sha1": "e109b297d2c4ee7a0bd6aed72f38f7e3185654cf",
+      "size": 2211261,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/1_9-pre5/minecraft.jar"
+    },
+    {
+      "id": "b1_9-pre6",
+      "wiki": "https://minecraft.wiki/w/Java_Edition_b1.9-pre6",
+      "url": "https://archive.org/download/Minecraft-JSONs/b1.9-pre6.json",
+      "sha1": "f0983e65cd1c0768b0d1fec471ce4f69173b8126",
+      "size": 2239270,
+      "jar": "https://archive.org/download/assets.minecraft.net-2013-11-13/assets.minecraft.net/1_9-pre6/minecraft.jar"
+    }
+  ]
+}
diff --git a/meta/meta/common/mojang.py b/meta/meta/common/mojang.py
new file mode 100644
index 0000000000..fe36c3c02b
--- /dev/null
+++ b/meta/meta/common/mojang.py
@@ -0,0 +1,23 @@
+from os.path import join, dirname
+
+BASE_DIR = "mojang"
+
+VERSION_MANIFEST_FILE = join(BASE_DIR, "version_manifest_v2.json")
+VERSIONS_DIR = join(BASE_DIR, "versions")
+ASSETS_DIR = join(BASE_DIR, "assets")
+
+STATIC_EXPERIMENTS_FILE = join(dirname(__file__), "mojang-minecraft-experiments.json")
+STATIC_OLD_SNAPSHOTS_FILE = join(
+    dirname(__file__), "mojang-minecraft-old-snapshots.json"
+)
+STATIC_OVERRIDES_FILE = join(dirname(__file__), "mojang-minecraft-legacy-override.json")
+STATIC_LEGACY_SERVICES_FILE = join(
+    dirname(__file__), "mojang-minecraft-legacy-services.json"
+)
+LIBRARY_PATCHES_FILE = join(dirname(__file__), "mojang-library-patches.json")
+
+MINECRAFT_COMPONENT = "net.minecraft"
+LWJGL_COMPONENT = "org.lwjgl"
+LWJGL3_COMPONENT = "org.lwjgl3"
+
+JAVA_MANIFEST_FILE = join(BASE_DIR, "java_all.json")
diff --git a/meta/meta/common/neoforge.py b/meta/meta/common/neoforge.py
new file mode 100644
index 0000000000..83f4890e97
--- /dev/null
+++ b/meta/meta/common/neoforge.py
@@ -0,0 +1,14 @@
+from os.path import join
+
+from ..model import GradleSpecifier, make_launcher_library
+
+BASE_DIR = "neoforge"
+
+JARS_DIR = join(BASE_DIR, "jars")
+INSTALLER_INFO_DIR = join(BASE_DIR, "installer_info")
+INSTALLER_MANIFEST_DIR = join(BASE_DIR, "installer_manifests")
+VERSION_MANIFEST_DIR = join(BASE_DIR, "version_manifests")
+FILE_MANIFEST_DIR = join(BASE_DIR, "files_manifests")
+DERIVED_INDEX_FILE = join(BASE_DIR, "derived_index.json")
+
+NEOFORGE_COMPONENT = "net.neoforged"
diff --git a/meta/meta/common/quilt.py b/meta/meta/common/quilt.py
new file mode 100644
index 0000000000..b8203898b0
--- /dev/null
+++ b/meta/meta/common/quilt.py
@@ -0,0 +1,44 @@
+from os.path import join
+from .fabric import INTERMEDIARY_COMPONENT as FABRIC_INTERMEDIARY_COMPONENT
+
+# Right now Quilt recommends using Fabric's intermediary
+USE_QUILT_MAPPINGS = False
+
+BASE_DIR = "quilt"
+
+JARS_DIR = join(BASE_DIR, "jars")
+INSTALLER_INFO_DIR = join(BASE_DIR, "loader-installer-json")
+META_DIR = join(BASE_DIR, "meta-v3")
+
+LOADER_COMPONENT = "org.quiltmc.quilt-loader"
+INTERMEDIARY_COMPONENT = "org.quiltmc.hashed"
+
+if not USE_QUILT_MAPPINGS:
+    INTERMEDIARY_COMPONENT = FABRIC_INTERMEDIARY_COMPONENT
+
+DISABLE_BEACON_ARG = "-Dloader.disable_beacon=true"
+DISABLE_BEACON_VERSIONS = {
+    "0.19.2-beta.3",
+    "0.19.2-beta.4",
+    "0.19.2-beta.5",
+    "0.19.2-beta.6",
+    "0.19.2-beta.7",
+    "0.19.2",
+    "0.19.3-beta.1",
+    "0.19.3",
+    "0.19.4",
+    "0.20.0-beta.1",
+    "0.20.0-beta.2",
+    "0.20.0-beta.3",
+    "0.20.0-beta.4",
+    "0.20.0-beta.5",
+    "0.20.0-beta.6",
+    "0.20.0-beta.7",
+    "0.20.0-beta.8",
+    "0.20.0-beta.9",
+    "0.20.0-beta.10",
+    "0.20.0-beta.11",
+    "0.20.0-beta.12",
+    "0.20.0-beta.13",
+    "0.20.0-beta.14",
+}
diff --git a/meta/meta/model/__init__.py b/meta/meta/model/__init__.py
new file mode 100644
index 0000000000..203b367ed5
--- /dev/null
+++ b/meta/meta/model/__init__.py
@@ -0,0 +1,363 @@
+import copy
+from datetime import datetime
+from pathlib import Path
+from typing import Optional, List, Dict, Any, Iterator
+
+import pydantic
+from pydantic import Field, validator  # type: ignore
+
+from ..common import (
+    LAUNCHER_MAVEN,
+    serialize_datetime,
+    replace_old_launchermeta_url,
+    get_all_bases,
+    merge_dict,
+)
+
+META_FORMAT_VERSION = 1
+
+
+class GradleSpecifier:
+    """
+    A gradle specifier - a maven coordinate. Like one of these:
+    "org.lwjgl.lwjgl:lwjgl:2.9.0"
+    "net.java.jinput:jinput:2.0.5"
+    "net.minecraft:launchwrapper:1.5"
+    """
+
+    def __init__(
+        self,
+        group: str,
+        artifact: str,
+        version: str,
+        classifier: Optional[str] = None,
+        extension: Optional[str] = None,
+    ):
+        if extension is None:
+            extension = "jar"
+        self.group = group
+        self.artifact = artifact
+        self.version = version
+        self.classifier = classifier
+        self.extension = extension
+
+    def __str__(self):
+        ext = ""
+        if self.extension != "jar":
+            ext = "@%s" % self.extension
+        if self.classifier:
+            return "%s:%s:%s:%s%s" % (
+                self.group,
+                self.artifact,
+                self.version,
+                self.classifier,
+                ext,
+            )
+        else:
+            return "%s:%s:%s%s" % (self.group, self.artifact, self.version, ext)
+
+    def filename(self):
+        if self.classifier:
+            return "%s-%s-%s.%s" % (
+                self.artifact,
+                self.version,
+                self.classifier,
+                self.extension,
+            )
+        else:
+            return "%s-%s.%s" % (self.artifact, self.version, self.extension)
+
+    def base(self):
+        return "%s/%s/%s/" % (self.group.replace(".", "/"), self.artifact, self.version)
+
+    def path(self):
+        return self.base() + self.filename()
+
+    def __repr__(self):
+        return f"GradleSpecifier('{self}')"
+
+    def is_lwjgl(self):
+        return self.group in (
+            "org.lwjgl",
+            "org.lwjgl.lwjgl",
+            "net.java.jinput",
+            "net.java.jutils",
+        )
+
+    def is_log4j(self):
+        return self.group == "org.apache.logging.log4j"
+
+    def __eq__(self, other: Any):
+        if isinstance(other, GradleSpecifier):
+            return str(self) == str(other)
+        else:
+            return False
+
+    def __lt__(self, other: "GradleSpecifier"):
+        return str(self) < str(other)
+
+    def __gt__(self, other: "GradleSpecifier"):
+        return str(self) > str(other)
+
+    def __hash__(self):
+        return hash(str(self))
+
+    @classmethod
+    def __get_validators__(cls):
+        yield cls.validate
+
+    @classmethod
+    def from_string(cls, v: str):
+        ext_split = v.split("@")
+
+        components = ext_split[0].split(":")
+        group = components[0]
+        artifact = components[1]
+        version = components[2]
+
+        extension = None
+        if len(ext_split) == 2:
+            extension = ext_split[1]
+
+        classifier = None
+        if len(components) == 4:
+            classifier = components[3]
+        return cls(group, artifact, version, classifier, extension)
+
+    @classmethod
+    def validate(cls, v: "str | GradleSpecifier"):
+        if isinstance(v, cls):
+            return v
+        if isinstance(v, str):
+            return cls.from_string(v)
+        raise TypeError("Invalid type")
+
+
+class MetaBase(pydantic.BaseModel):
+    def dict(self, **kwargs: Any) -> Dict[str, Any]:
+        for k in ["by_alias"]:
+            if k in kwargs:
+                del kwargs[k]
+
+        return super(MetaBase, self).dict(by_alias=True, **kwargs)
+
+    def json(self, **kwargs: Any) -> str:
+        for k in ["exclude_none", "sort_keys", "indent"]:
+            if k in kwargs:
+                del kwargs[k]
+
+        return super(MetaBase, self).json(
+            exclude_none=True, sort_keys=True, by_alias=True, indent=4, **kwargs
+        )
+
+    def write(self, file_path: str):
+        Path(file_path).parent.mkdir(parents=True, exist_ok=True)
+        with open(file_path, "w") as f:
+            f.write(self.json())
+
+    def merge(self, other: "MetaBase"):
+        """
+        Merge other object with self.
+        - Concatenates lists
+        - Combines sets
+        - Merges dictionaries (other takes priority)
+        - Recurses for all fields that are also MetaBase classes
+        - Overwrites for any other field type (int, string, ...)
+        """
+        assert type(other) is type(self)
+        for key, field in self.__fields__.items():
+            ours = getattr(self, key)
+            theirs = getattr(other, key)
+            if theirs is None:
+                continue
+            if ours is None:
+                setattr(self, key, theirs)
+                continue
+
+            if isinstance(ours, list):
+                ours += theirs
+            elif isinstance(ours, set):
+                ours |= theirs
+            elif isinstance(ours, dict):
+                result = merge_dict(ours, copy.deepcopy(theirs))  # type: ignore
+                setattr(self, key, result)
+            elif MetaBase in get_all_bases(field.type_):
+                ours.merge(theirs)
+            else:
+                setattr(self, key, theirs)
+
+    def __hash__(self):  # type: ignore
+        return hash(self.json())
+
+    class Config:
+        allow_population_by_field_name = True
+
+        json_encoders = {datetime: serialize_datetime, GradleSpecifier: str}
+
+
+class Versioned(MetaBase):
+    @validator("format_version")
+    def format_version_must_be_supported(cls, v: int):
+        assert v <= META_FORMAT_VERSION
+        return v
+
+    format_version: int = Field(META_FORMAT_VERSION, alias="formatVersion")
+
+
+class MojangArtifactBase(MetaBase):
+    sha1: Optional[str]
+    size: Optional[int]
+    url: str
+
+
+class MojangAssets(MojangArtifactBase):
+    @validator("url")
+    def validate_url(cls, v: str):
+        return replace_old_launchermeta_url(v)
+
+    id: str
+    totalSize: int
+
+
+class MojangArtifact(MojangArtifactBase):
+    path: Optional[str]
+
+
+class MojangLibraryExtractRules(MetaBase):
+    """
+    "rules": [
+        {
+            "action": "allow"
+        },
+        {
+            "action": "disallow",
+            "os": {
+                "name": "osx"
+            }
+        }
+    ]
+    """
+
+    exclude: List[str]  # TODO maybe drop this completely?
+
+
+class MojangLibraryDownloads(MetaBase):
+    artifact: Optional[MojangArtifact]
+    classifiers: Optional[Dict[Any, MojangArtifact]]
+
+
+class OSRule(MetaBase):
+    @validator("name")
+    def name_must_be_os(cls, v: str):
+        assert v in [
+            "osx",
+            "linux",
+            "windows",
+            "windows-arm64",
+            "osx-arm64",
+            "linux-arm64",
+            "linux-arm32",
+            "linux-riscv64",
+        ]
+        return v
+
+    name: str
+    version: Optional[str]
+
+
+class MojangRule(MetaBase):
+    @validator("action")
+    def action_must_be_allow_disallow(cls, v: str):
+        assert v in ["allow", "disallow"]
+        return v
+
+    action: str
+    os: Optional[OSRule]
+
+
+class MojangRules(MetaBase):
+    __root__: List[MojangRule]
+
+    def __iter__(self) -> Iterator[MojangRule]:  # type: ignore
+        return iter(self.__root__)
+
+    def __getitem__(self, item: int) -> MojangRule:
+        return self.__root__[item]
+
+
+class MojangLoggingArtifact(MojangArtifactBase):
+    id: str
+
+
+class MojangLogging(MetaBase):
+    @validator("type")
+    def validate_type(cls, v):
+        assert v in ["log4j2-xml"]
+        return v
+
+    file: MojangLoggingArtifact
+    argument: str
+    type: str
+
+
+class Library(MetaBase):
+    extract: Optional[MojangLibraryExtractRules]
+    name: Optional[GradleSpecifier]
+    downloads: Optional[MojangLibraryDownloads]
+    natives: Optional[Dict[str, str]]
+    rules: Optional[MojangRules]
+    url: Optional[str]
+    mmcHint: Optional[str] = Field(None, alias="MMC-hint")
+
+
+class JavaAgent(Library):
+    argument: Optional[str]
+
+
+class Dependency(MetaBase):
+    uid: str
+    equals: Optional[str]
+    suggests: Optional[str]
+
+
+class MetaVersion(Versioned):
+    name: str
+    version: str
+    uid: str
+    type: Optional[str]
+    order: Optional[int]
+    volatile: Optional[bool]
+    requires: Optional[List[Dependency]]
+    conflicts: Optional[List[Dependency]]
+    libraries: Optional[List[Library]]
+    asset_index: Optional[MojangAssets] = Field(alias="assetIndex")
+    maven_files: Optional[List[Library]] = Field(alias="mavenFiles")
+    main_jar: Optional[Library] = Field(alias="mainJar")
+    jar_mods: Optional[List[Library]] = Field(alias="jarMods")
+    main_class: Optional[str] = Field(alias="mainClass")
+    applet_class: Optional[str] = Field(alias="appletClass")
+    minecraft_arguments: Optional[str] = Field(alias="minecraftArguments")
+    release_time: Optional[datetime] = Field(alias="releaseTime")
+    compatible_java_majors: Optional[List[int]] = Field(alias="compatibleJavaMajors")
+    compatible_java_name: Optional[str] = Field(alias="compatibleJavaName")
+    java_agents: Optional[List[JavaAgent]] = Field(alias="+agents")
+    additional_traits: Optional[List[str]] = Field(alias="+traits")
+    additional_tweakers: Optional[List[str]] = Field(alias="+tweakers")
+    additional_jvm_args: Optional[List[str]] = Field(alias="+jvmArgs")
+    logging: Optional[MojangLogging]
+
+
+class MetaPackage(Versioned):
+    name: str
+    uid: str
+    recommended: Optional[List[str]]
+    authors: Optional[List[str]]
+    description: Optional[str]
+    project_url: Optional[str] = Field(alias="projectUrl")
+
+
+def make_launcher_library(
+    name: GradleSpecifier, hash: str, size: int, maven=LAUNCHER_MAVEN
+):
+    artifact = MojangArtifact(url=maven % name.path(), sha1=hash, size=size)
+    return Library(name=name, downloads=MojangLibraryDownloads(artifact=artifact))
diff --git a/meta/meta/model/enum.py b/meta/meta/model/enum.py
new file mode 100644
index 0000000000..08dda4bf4a
--- /dev/null
+++ b/meta/meta/model/enum.py
@@ -0,0 +1,32 @@
+import enum
+
+
+class StrEnum(str, enum.Enum):
+    """
+    StrEnum is a Python ``enum.Enum`` that inherits from ``str``. The default
+    ``auto()`` behavior uses the member name as its value.
+
+    Example usage::
+
+        class Example(StrEnum):
+            UPPER_CASE = auto()
+            lower_case = auto()
+            MixedCase = auto()
+
+        assert Example.UPPER_CASE == "UPPER_CASE"
+        assert Example.lower_case == "lower_case"
+        assert Example.MixedCase == "MixedCase"
+    """
+
+    def __new__(cls, value, *args, **kwargs):
+        if not isinstance(value, (str, enum.auto)):
+            raise TypeError(
+                f"Values of StrEnums must be strings: {value!r} is a {type(value)}"
+            )
+        return super().__new__(cls, value, *args, **kwargs)
+
+    def __str__(self):
+        return str(self.value)
+
+    def _generate_next_value_(name, *_):
+        return name
diff --git a/meta/meta/model/fabric.py b/meta/meta/model/fabric.py
new file mode 100644
index 0000000000..5cb0e9caab
--- /dev/null
+++ b/meta/meta/model/fabric.py
@@ -0,0 +1,40 @@
+from datetime import datetime
+from typing import Optional, List, Union
+
+from pydantic import Field
+
+from . import Library, MetaBase
+
+
+class FabricInstallerArguments(MetaBase):
+    client: Optional[List[str]]
+    common: Optional[List[str]]
+    server: Optional[List[str]]
+
+
+class FabricInstallerLaunchwrapper(MetaBase):
+    tweakers: FabricInstallerArguments
+
+
+class FabricInstallerLibraries(MetaBase):
+    client: Optional[List[Library]]
+    common: Optional[List[Library]]
+    server: Optional[List[Library]]
+
+
+class FabricMainClasses(MetaBase):
+    client: Optional[str]
+    common: Optional[str]
+    server: Optional[str]
+
+
+class FabricInstallerDataV1(MetaBase):
+    version: int
+    libraries: FabricInstallerLibraries
+    main_class: Optional[Union[str, FabricMainClasses]] = Field(alias="mainClass")
+    arguments: Optional[FabricInstallerArguments]
+    launchwrapper: Optional[FabricInstallerLaunchwrapper]
+
+
+class FabricJarInfo(MetaBase):
+    release_time: Optional[datetime] = Field(alias="releaseTime")
diff --git a/meta/meta/model/forge.py b/meta/meta/model/forge.py
new file mode 100644
index 0000000000..a59b87aa5c
--- /dev/null
+++ b/meta/meta/model/forge.py
@@ -0,0 +1,365 @@
+from datetime import datetime
+from typing import Optional, List, Dict
+
+from pydantic import Field
+
+from . import MetaBase, GradleSpecifier, Library
+from .mojang import MojangVersion
+
+
+class ForgeFile(MetaBase):
+    classifier: str
+    hash: str
+    extension: str
+
+    def filename(self, long_version):
+        return "%s-%s-%s.%s" % ("forge", long_version, self.classifier, self.extension)
+
+    def url(self, long_version):
+        return "https://maven.minecraftforge.net/net/minecraftforge/forge/%s/%s" % (
+            long_version,
+            self.filename(long_version),
+        )
+
+
+class ForgeEntry(MetaBase):
+    long_version: str = Field(alias="longversion")
+    mc_version: str = Field(alias="mcversion")
+    version: str
+    build: int
+    branch: Optional[str]
+    latest: Optional[bool]
+    recommended: Optional[bool]
+    files: Optional[Dict[str, ForgeFile]]
+
+
+class ForgeMCVersionInfo(MetaBase):
+    latest: Optional[str]
+    recommended: Optional[str]
+    versions: List[str] = Field([])
+
+
+class DerivedForgeIndex(MetaBase):
+    versions: Dict[str, ForgeEntry] = Field({})
+    by_mc_version: Dict[str, ForgeMCVersionInfo] = Field({}, alias="by_mcversion")
+
+
+class FMLLib(
+    MetaBase
+):  # old ugly stuff. Maybe merge this with Library or Library later
+    filename: str
+    checksum: str
+    ours: bool
+
+
+class ForgeInstallerProfileInstallSection(MetaBase):
+    """
+    "install": {
+        "profileName": "Forge",
+        "target":"Forge8.9.0.753",
+        "path":"net.minecraftforge:minecraftforge:8.9.0.753",
+        "version":"Forge 8.9.0.753",
+        "filePath":"minecraftforge-universal-1.6.1-8.9.0.753.jar",
+        "welcome":"Welcome to the simple Forge installer.",
+        "minecraft":"1.6.1",
+        "logo":"/big_logo.png",
+        "mirrorList": "http://files.minecraftforge.net/mirror-brand.list"
+    },
+    "install": {
+        "profileName": "forge",
+        "target":"1.11-forge1.11-13.19.0.2141",
+        "path":"net.minecraftforge:forge:1.11-13.19.0.2141",
+        "version":"forge 1.11-13.19.0.2141",
+        "filePath":"forge-1.11-13.19.0.2141-universal.jar",
+        "welcome":"Welcome to the simple forge installer.",
+        "minecraft":"1.11",
+        "mirrorList" : "http://files.minecraftforge.net/mirror-brand.list",
+        "logo":"/big_logo.png",
+        "modList":"none"
+    },
+    """
+
+    profile_name: str = Field(alias="profileName")
+    target: str
+    path: GradleSpecifier
+    version: str
+    file_path: str = Field(alias="filePath")
+    welcome: str
+    minecraft: str
+    logo: str
+    mirror_list: str = Field(alias="mirrorList")
+    mod_list: Optional[str] = Field(alias="modList")
+
+
+class ForgeLibrary(Library):
+    url: Optional[str]
+    server_req: Optional[bool] = Field(alias="serverreq")
+    client_req: Optional[bool] = Field(alias="clientreq")
+    checksums: Optional[List[str]]
+    comment: Optional[str]
+
+
+class ForgeVersionFile(MojangVersion):
+    libraries: Optional[List[ForgeLibrary]]  # overrides Mojang libraries
+    inherits_from: Optional[str] = Field("inheritsFrom")
+    jar: Optional[str]
+
+
+class ForgeOptional(MetaBase):
+    """
+    "optionals": [
+        {
+            "name": "Mercurius",
+            "client": true,
+            "server": true,
+            "default": true,
+            "inject": true,
+            "desc": "A mod that collects statistics about Minecraft and your system.<br>Useful for Forge to understand how Minecraft/Forge are used.",
+            "url": "http://www.minecraftforge.net/forum/index.php?topic=43278.0",
+            "artifact": "net.minecraftforge:MercuriusUpdater:1.11.2",
+            "maven": "http://maven.minecraftforge.net/"
+        }
+    ]
+    """
+
+    name: Optional[str]
+    client: Optional[bool]
+    server: Optional[bool]
+    default: Optional[bool]
+    inject: Optional[bool]
+    desc: Optional[str]
+    url: Optional[str]
+    artifact: Optional[GradleSpecifier]
+    maven: Optional[str]
+
+
+class ForgeInstallerProfile(MetaBase):
+    install: ForgeInstallerProfileInstallSection
+    version_info: ForgeVersionFile = Field(alias="versionInfo")
+    optionals: Optional[List[ForgeOptional]]
+
+
+class ForgeLegacyInfo(MetaBase):
+    release_time: Optional[datetime] = Field(alias="releaseTime")
+    size: Optional[int]
+    sha256: Optional[str]
+    sha1: Optional[str]
+
+
+class ForgeLegacyInfoList(MetaBase):
+    number: Dict[str, ForgeLegacyInfo] = Field({})
+
+
+class DataSpec(MetaBase):
+    client: Optional[str]
+    server: Optional[str]
+
+
+class ProcessorSpec(MetaBase):
+    jar: Optional[str]
+    classpath: Optional[List[str]]
+    args: Optional[List[str]]
+    outputs: Optional[Dict[str, str]]
+    sides: Optional[List[str]]
+
+
+class ForgeInstallerProfileV2(MetaBase):
+    _comment: Optional[List[str]]
+    spec: Optional[int]
+    profile: Optional[str]
+    version: Optional[str]
+    icon: Optional[str]
+    json_data: Optional[str] = Field(alias="json")
+    path: Optional[GradleSpecifier]
+    logo: Optional[str]
+    minecraft: Optional[str]
+    welcome: Optional[str]
+    data: Optional[Dict[str, DataSpec]]
+    processors: Optional[List[ProcessorSpec]]
+    libraries: Optional[List[Library]]
+    mirror_list: Optional[str] = Field(alias="mirrorList")
+    server_jar_path: Optional[str] = Field(alias="serverJarPath")
+
+
+class InstallerInfo(MetaBase):
+    sha1hash: Optional[str]
+    sha256hash: Optional[str]
+    size: Optional[int]
+
+
+# A post-processed entry constructed from the reconstructed Forge version index
+class ForgeVersion:
+    def __init__(self, entry: ForgeEntry):
+        self.build = entry.build
+        self.rawVersion = entry.version
+        self.mc_version = entry.mc_version
+        self.mc_version_sane = self.mc_version.replace("_pre", "-pre", 1)
+        self.branch = entry.branch
+        self.installer_filename = None
+        self.installer_url = None
+        self.universal_filename = None
+        self.universal_url = None
+        self.changelog_url = None
+        self.long_version = "%s-%s" % (self.mc_version, self.rawVersion)
+        if self.branch is not None:
+            self.long_version += "-%s" % self.branch
+
+        # this comment's whole purpose is to say this: cringe
+        for classifier, file in entry.files.items():
+            extension = file.extension
+            filename = file.filename(self.long_version)
+            url = file.url(self.long_version)
+            if (classifier == "installer") and (extension == "jar"):
+                self.installer_filename = filename
+                self.installer_url = url
+            if (classifier == "universal" or classifier == "client") and (
+                extension == "jar" or extension == "zip"
+            ):
+                self.universal_filename = filename
+                self.universal_url = url
+            if (classifier == "changelog") and (extension == "txt"):
+                self.changelog_url = url
+
+    def name(self):
+        return "Forge %d" % self.build
+
+    def uses_installer(self):
+        if self.installer_url is None:
+            return False
+        if self.mc_version == "1.5.2":
+            return False
+        return True
+
+    def filename(self):
+        if self.uses_installer():
+            return self.installer_filename
+        return self.universal_filename
+
+    def url(self):
+        if self.uses_installer():
+            return self.installer_url
+        return self.universal_url
+
+    def is_supported(self):
+        if self.url() is None:
+            return False
+
+        foo = self.rawVersion.split(".")
+        if len(foo) < 1:
+            return False
+
+        major_version = foo[0]
+        if not major_version.isnumeric():
+            return False
+
+        # majorVersion = int(majorVersionStr)
+        # if majorVersion >= 37:
+        #    return False
+
+        return True
+
+
+def fml_libs_for_version(mc_version: str) -> List[FMLLib]:
+    argo_2_25 = FMLLib(
+        filename="argo-2.25.jar",
+        checksum="bb672829fde76cb163004752b86b0484bd0a7f4b",
+        ours=False,
+    )
+    argo_small_3_2 = FMLLib(
+        filename="argo-small-3.2.jar",
+        checksum="58912ea2858d168c50781f956fa5b59f0f7c6b51",
+        ours=False,
+    )
+    guava_12_0_1 = FMLLib(
+        filename="guava-12.0.1.jar",
+        checksum="b8e78b9af7bf45900e14c6f958486b6ca682195f",
+        ours=False,
+    )
+    guava_14_0_rc3 = FMLLib(
+        filename="guava-14.0-rc3.jar",
+        checksum="931ae21fa8014c3ce686aaa621eae565fefb1a6a",
+        ours=False,
+    )
+    asm_all_4_0 = FMLLib(
+        filename="asm-all-4.0.jar",
+        checksum="98308890597acb64047f7e896638e0d98753ae82",
+        ours=False,
+    )
+    asm_all_4_1 = FMLLib(
+        filename="asm-all-4.1.jar",
+        checksum="054986e962b88d8660ae4566475658469595ef58",
+        ours=False,
+    )
+    bcprov_jdk15on_147 = FMLLib(
+        filename="bcprov-jdk15on-147.jar",
+        checksum="b6f5d9926b0afbde9f4dbe3db88c5247be7794bb",
+        ours=False,
+    )
+    bcprov_jdk15on_148 = FMLLib(
+        filename="bcprov-jdk15on-148.jar",
+        checksum="960dea7c9181ba0b17e8bab0c06a43f0a5f04e65",
+        ours=True,
+    )
+    scala_library = FMLLib(
+        filename="scala-library.jar",
+        checksum="458d046151ad179c85429ed7420ffb1eaf6ddf85",
+        ours=True,
+    )
+
+    deobfuscation_data_1_5 = FMLLib(
+        filename="deobfuscation_data_1.5.zip",
+        checksum="5f7c142d53776f16304c0bbe10542014abad6af8",
+        ours=False,
+    )
+
+    deobfuscation_data_1_5_1 = FMLLib(
+        filename="deobfuscation_data_1.5.1.zip",
+        checksum="22e221a0d89516c1f721d6cab056a7e37471d0a6",
+        ours=False,
+    )
+    deobfuscation_data_1_5_2 = FMLLib(
+        filename="deobfuscation_data_1.5.2.zip",
+        checksum="446e55cd986582c70fcf12cb27bc00114c5adfd9",
+        ours=False,
+    )
+    if mc_version == "1.3.2":
+        return [argo_2_25, guava_12_0_1, asm_all_4_0]
+    elif mc_version in [
+        "1.4",
+        "1.4.1",
+        "1.4.2",
+        "1.4.3",
+        "1.4.4",
+        "1.4.5",
+        "1.4.6",
+        "1.4.7",
+    ]:
+        return [argo_2_25, guava_12_0_1, asm_all_4_0, bcprov_jdk15on_147]
+    elif mc_version == "1.5":
+        return [
+            argo_small_3_2,
+            guava_14_0_rc3,
+            asm_all_4_1,
+            bcprov_jdk15on_148,
+            deobfuscation_data_1_5,
+            scala_library,
+        ]
+    elif mc_version == "1.5.1":
+        return [
+            argo_small_3_2,
+            guava_14_0_rc3,
+            asm_all_4_1,
+            bcprov_jdk15on_148,
+            deobfuscation_data_1_5_1,
+            scala_library,
+        ]
+    elif mc_version == "1.5.2":
+        return [
+            argo_small_3_2,
+            guava_14_0_rc3,
+            asm_all_4_1,
+            bcprov_jdk15on_148,
+            deobfuscation_data_1_5_2,
+            scala_library,
+        ]
+    return []
diff --git a/meta/meta/model/index.py b/meta/meta/model/index.py
new file mode 100644
index 0000000000..c6d82e1aff
--- /dev/null
+++ b/meta/meta/model/index.py
@@ -0,0 +1,46 @@
+from datetime import datetime
+from typing import Optional, List
+
+from pydantic import Field
+
+from meta.model import Dependency, MetaBase, Versioned, MetaVersion
+
+
+class MetaVersionIndexEntry(MetaBase):
+    version: str
+    type: Optional[str]
+    release_time: datetime = Field(alias="releaseTime")
+    requires: Optional[List[Dependency]]
+    conflicts: Optional[List[Dependency]]
+    recommended: Optional[bool]
+    volatile: Optional[bool]
+    sha256: str
+
+    @classmethod
+    def from_meta_version(cls, v: MetaVersion, recommended: bool, sha256: str):
+        return cls(
+            version=v.version,
+            type=v.type,
+            release_time=v.release_time,
+            requires=v.requires,
+            conflicts=v.conflicts,
+            recommended=recommended,
+            volatile=v.volatile,
+            sha256=sha256,
+        )
+
+
+class MetaVersionIndex(Versioned):
+    name: str
+    uid: str
+    versions: List[MetaVersionIndexEntry] = Field([])
+
+
+class MetaPackageIndexEntry(MetaBase):
+    name: str
+    uid: str
+    sha256: str
+
+
+class MetaPackageIndex(Versioned):
+    packages: List[MetaPackageIndexEntry] = Field([])
diff --git a/meta/meta/model/java.py b/meta/meta/model/java.py
new file mode 100644
index 0000000000..c3efde9292
--- /dev/null
+++ b/meta/meta/model/java.py
@@ -0,0 +1,597 @@
+from . import (
+    MetaBase,
+    MetaVersion,
+    Versioned,
+)
+from pydantic import Field
+from datetime import datetime
+from enum import IntEnum, Enum
+from .enum import StrEnum
+from typing import Optional, Any, NamedTuple, Generator
+from urllib.parse import urlencode, urlparse, urlunparse
+from functools import total_ordering
+
+# namedtuple to match the internal signature of urlunparse
+
+
+class JavaRuntimeOS(StrEnum):
+    MacOsX64 = "mac-os-x64"
+    MacOsX86 = "mac-os-x86"  # rare
+    MacOsArm64 = "mac-os-arm64"
+    # MacOsArm32 = "mac-os-arm32" # doesn't exist
+    LinuxX64 = "linux-x64"
+    LinuxX86 = "linux-x86"
+    LinuxArm64 = "linux-arm64"
+    LinuxArm32 = "linux-arm32"
+    LinuxRiscv64 = "linux-riscv64"
+    WindowsX64 = "windows-x64"
+    WindowsX86 = "windows-x86"
+    WindowsArm64 = "windows-arm64"
+    WindowsArm32 = "windows-arm32"
+    Unknown = "unknown"
+
+
+class JavaRuntimeDownloadType(StrEnum):
+    Manifest = "manifest"
+    Archive = "archive"
+
+
+@total_ordering
+class JavaVersionMeta(MetaBase):
+    major: int
+    minor: int
+    security: int
+    build: Optional[int] = None
+    buildstr: Optional[str] = None
+    name: Optional[str] = None
+
+    def __str__(self):
+        ver = f"{self.major}.{self.minor}.{self.security}"
+        if self.build is not None:
+            ver = f"{ver}+{self.build}"
+        if self.buildstr is not None:
+            ver = f"{ver}-{self.buildstr}"
+        return ver
+
+    def to_tuple(self):
+        build = 0
+        if self.build is not None:
+            build = self.build
+        return (self.major, self.minor, self.security, build, self.buildstr)
+
+    def __eq__(self, other: Any):
+        return self.to_tuple() == other.to_tuple()
+
+    def __lt__(self, other: "JavaVersionMeta"):
+        return self.to_tuple() < other.to_tuple()
+
+
+class JavaChecksumType(StrEnum):
+    Sha1 = "sha1"
+    Sha256 = "sha256"
+
+
+class JavaChecksumMeta(MetaBase):
+    type: JavaChecksumType
+    hash: str
+
+
+class JavaPackageType(StrEnum):
+    Jre = "jre"
+    Jdk = "jdk"
+
+
+class JavaRuntimeMeta(MetaBase):
+    name: str
+    vendor: str
+    url: str
+    release_time: datetime = Field(alias="releaseTime")
+    checksum: Optional[JavaChecksumMeta]
+    download_type: JavaRuntimeDownloadType = Field(alias="downloadType")
+    package_type: JavaPackageType = Field(alias="packageType")
+    version: JavaVersionMeta
+    runtime_os: JavaRuntimeOS = Field(alias="runtimeOS")
+
+
+class JavaRuntimeVersion(MetaVersion):
+    runtimes: list[JavaRuntimeMeta]
+
+
+class URLComponents(NamedTuple):
+    scheme: str
+    netloc: str
+    url: str
+    path: str
+    query: str
+    fragment: str
+
+
+class APIQuery(MetaBase):
+    def to_query(self):
+        set_parts: dict[str, Any] = {}
+        for key, value in self.dict().items():
+            if value is not None:
+                if isinstance(value, Enum):
+                    set_parts[key] = value.value
+                elif isinstance(value, list):
+                    if len(value) > 0:  # type: ignore
+                        set_parts[key] = value
+                elif isinstance(value, datetime):
+                    set_parts[key] = value.isoformat()
+                else:
+                    set_parts[key] = value
+        return urlencode(set_parts, doseq=True)
+
+
+# Adoptx refers to both Adoptium (Eclipse Temurin) and AdoptOpenJDK (IBM Semeru Runtime Open Edition)
+class AdoptxJvmImpl(StrEnum):
+    Hotspot = "hotspot"
+    OpenJ9 = "openj9"
+
+
+class AdoptxVendor(StrEnum):
+    Eclipse = "eclipse"
+    Ibm = "ibm"
+
+
+class AdoptxArchitecture(StrEnum):
+    X64 = "x64"
+    X86 = "x86"
+    X32 = "x32"
+    Ppc64 = "ppc64"
+    Ppc64le = "ppc64le"
+    S390x = "s390x"
+    Aarch64 = "aarch64"
+    Arm = "arm"
+    Sparcv9 = "sparcv9"
+    Riscv64 = "riscv64"
+
+
+class AdoptxReleaseType(StrEnum):
+    GeneralAccess = "ga"
+    EarlyAccess = "ea"
+
+
+class AdoptxSortMethod(StrEnum):
+    Default = "DEFAULT"
+    Date = "DATE"
+
+
+class AdoptxSortOrder(StrEnum):
+    Asc = "ASC"
+    Desc = "DESC"
+
+
+class AdoptxImageType(StrEnum):
+    Jdk = "jdk"
+    Jre = "jre"
+    Testimage = "testimage"
+    Debugimage = "debugimage"
+    Staticlibs = "staticlibs"
+    Sources = "sources"
+    Sbom = "sbom"
+
+
+class AdoptxHeapSize(StrEnum):
+    Normal = "normal"
+    Large = "large"
+
+
+class AdoptxProject(StrEnum):
+    Jdk = "jdk"
+    Valhalla = "valhalla"
+    Metropolis = "metropolis"
+    Jfr = "jfr"
+    Shenandoah = "shenandoah"
+
+
+class AdoptxCLib(StrEnum):
+    Musl = "musl"
+    Glibc = "glibc"
+
+
+class AdoptxOs(StrEnum):
+    Linux = "linux"
+    Windows = "windows"
+    Mac = "mac"
+    Solaris = "solaris"
+    Aix = "aix"
+    AlpineLinux = "alpine-linux"
+
+
+ADOPTIUM_API_BASE = "https://api.adoptium.net"
+OPENJ9_API_BASE = " https://api.adoptopenjdk.net"
+ADOPTX_API_FEATURE_RELEASES = (
+    f"{{base_url}}/v3/assets/feature_releases/{{feature_version}}/{{release_type}}"
+)
+# ?image_type={{image_type}}&heap_size={{heap_size}}&project={{project}}&vendor={{vendor}}&page_size={{page_size}}&page={{page}}&sort_method={{sort_method}}&sort_order={{sort_order}}
+ADOPTX_API_AVAILABLE_RELEASES = f"{{base_url}}/v3/info/available_releases"
+
+
+class AdoptxAPIFeatureReleasesQuery(APIQuery):
+    architecture: Optional[AdoptxArchitecture] = None
+    before: Optional[datetime] = None
+    c_lib: Optional[AdoptxCLib] = None
+    heap_size: Optional[AdoptxHeapSize] = AdoptxHeapSize.Normal
+    image_type: Optional[AdoptxImageType] = None
+    jvm_impl: Optional[AdoptxJvmImpl] = None
+    os: Optional[AdoptxOs] = None
+    vendor: Optional[AdoptxVendor] = None
+    page_size: int = 10
+    page: int = 0
+    project: Optional[AdoptxProject] = AdoptxProject.Jdk
+    sort_method: Optional[AdoptxSortMethod] = AdoptxSortMethod.Default
+    sort_order: Optional[AdoptxSortOrder] = AdoptxSortOrder.Desc
+
+
+def adoptxAPIFeatureReleasesUrl(
+    base_url: str,
+    feature_version: int,
+    release_type: AdoptxReleaseType = AdoptxReleaseType.GeneralAccess,
+    query: AdoptxAPIFeatureReleasesQuery = AdoptxAPIFeatureReleasesQuery(),
+):
+    url = urlparse(
+        ADOPTX_API_FEATURE_RELEASES.format(
+            base_url=base_url,
+            feature_version=feature_version,
+            release_type=release_type.value,
+        )
+    )
+    return urlunparse(url._replace(query=query.to_query()))
+
+
+def adoptiumAPIFeatureReleasesUrl(
+    feature_version: int,
+    release_type: AdoptxReleaseType = AdoptxReleaseType.GeneralAccess,
+    query: AdoptxAPIFeatureReleasesQuery = AdoptxAPIFeatureReleasesQuery(),
+):
+    return adoptxAPIFeatureReleasesUrl(
+        feature_version=feature_version,
+        release_type=release_type,
+        query=query,
+        base_url=ADOPTIUM_API_BASE,
+    )
+
+
+def openj9APIFeatureReleasesUrl(
+    feature_version: int,
+    release_type: AdoptxReleaseType = AdoptxReleaseType.GeneralAccess,
+    query: AdoptxAPIFeatureReleasesQuery = AdoptxAPIFeatureReleasesQuery(),
+):
+    return adoptxAPIFeatureReleasesUrl(
+        feature_version=feature_version,
+        release_type=release_type,
+        query=query,
+        base_url=OPENJ9_API_BASE,
+    )
+
+
+class AdoptxAvailableReleases(MetaBase):
+    available_releases: list[int]
+    available_lts_releases: list[int]
+    most_recent_lts: Optional[int]
+    most_recent_feature_release: Optional[int]
+    most_recent_feature_version: Optional[int]
+    tip_version: Optional[int]
+
+
+class AdoptxFile(MetaBase):
+    name: str
+    link: str
+    size: Optional[int]
+
+
+class AdoptxPackage(AdoptxFile):
+    checksum: Optional[str]
+    checksum_link: Optional[str]
+    signature_link: Optional[str]
+    metadata_link: Optional[str]
+    # we intentionally omit download_count
+
+
+class AdoptxBinary(MetaBase):
+    os: str
+    architecture: AdoptxArchitecture
+    image_type: AdoptxImageType
+    c_lib: Optional[AdoptxCLib]
+    jvm_impl: AdoptxJvmImpl
+    package: Optional[AdoptxPackage]
+    installer: Optional[AdoptxPackage]
+    heap_size: AdoptxHeapSize
+    updated_at: datetime
+    scm_ref: Optional[str]
+    project: AdoptxProject
+    # we intentionally omit download_count
+
+
+class AdoptxVersion(MetaBase):
+    major: Optional[int]
+    minor: Optional[int]
+    security: Optional[int]
+    patch: Optional[int]
+    pre: Optional[str]
+    adopt_build_number: Optional[int]
+    semver: str
+    openjdk_version: str
+    build: Optional[int]
+    optional: Optional[str]
+
+
+class AdoptxRelease(MetaBase):
+    release_id: str = Field(alias="id")
+    release_link: str
+    release_name: str
+    timestamp: datetime
+    updated_at: datetime
+    binaries: list[AdoptxBinary]
+    release_type: str
+    vendor: AdoptxVendor
+    version_data: AdoptxVersion
+    source: Optional[AdoptxFile]
+    release_notes: Optional[AdoptxFile]
+    # we intentionally omit download_count
+
+
+class AdoptxReleases(MetaBase):
+    __root__: list[AdoptxRelease]
+
+    def __iter__(self) -> Generator[tuple[str, AdoptxRelease], None, None]:
+        yield from ((str(i), val) for i, val in enumerate(self.__root__))
+
+    def __getitem__(self, item: int) -> AdoptxRelease:
+        return self.__root__[item]
+
+    def append(self, rls: AdoptxRelease):
+        self.__root__.append(rls)
+
+
+class AzulProduct(StrEnum):
+    Zulu = "zulu"
+
+
+class AzulAvailabilityType(StrEnum):
+    SA = "SA"
+    CA = "CA"
+    NV = "NV"
+    _LA = "LA"
+
+
+class AzulJavaPackageType(StrEnum):
+    Jdk = "jdk"
+    Jre = "jre"
+
+
+class AzulReleaseType(StrEnum):
+    CPU = "CPU"
+    PSU = "PSU"
+    LU = "LU"
+
+
+class AzulOs(StrEnum):
+    Linux = "linux"
+    Macos = "macos"
+    Qnx = "qnx"
+    Windows = "windows"
+    Solaris = "solaris"
+
+
+class AzulLibCType(StrEnum):
+    Glibc = "glibc"
+    Uclibc = "uclibc"
+    Musl = "musl"
+
+
+class AzulCPUGen(StrEnum):
+    V5 = "v5"
+    V6kV6kz = "v6k_v6kz"
+    V6t2 = "v6t2"
+    V7 = "v7"
+    V8 = "v8"
+
+
+class AzulArch(StrEnum):
+    Arm = "arm"
+    X86 = "x86"
+    Mips = "mips"
+    Ppc = "ppc"
+    Sparcv9 = "sparcv9"
+    Sparc = "sparc"
+
+
+class AzulHwBitness(IntEnum):
+    X32 = 32
+    X64 = 64
+
+
+class AzulAbi(StrEnum):
+    HardFloat = "hard_float"
+    SoftFloat = "soft_float"
+    Spe = "spe"
+    Any = "any"
+
+
+class AzulArchiveType(StrEnum):
+    Deb = "deb"
+    Rpm = "rpm"
+    Dmg = "dmg"
+    Targz = "tar.gz"
+    Zip = "zip"
+    Cab = "cab"
+    Msi = "msi"
+
+
+class AzulReleaseStatus(StrEnum):
+    Eval = "eval"
+    Ea = "ea"
+    Ga = "ga"
+    Both = "both"
+
+
+class AzulSupportTerm(StrEnum):
+    Sts = "sts"
+    Mts = "mts"
+    Lts = "lts"
+
+
+class AzulCertifications(StrEnum):
+    Tck = "tck"
+    _Aqavit = "aqavit"
+    none = "none"
+
+
+class AzulSignatureType(StrEnum):
+    Openpgp = "openpgp"
+
+
+class AzulOsQueryParam(StrEnum):
+    Macos = "macos"
+    Windows = "windows"
+    Linux = "linux"
+    LinuxMusl = "linux-musl"
+    LinuxGlibc = "linux-glibc"
+    Qnx = "qnx"
+    Solaris = "solaris"
+
+
+class AzulArchQueryParam(StrEnum):
+    X86 = "x86"
+    X64 = "x64"
+    Amd64 = "amd64"
+    I686 = "i686"
+    Arm = "arm"
+    Aarch64 = "aarch64"
+    Aarch32 = "aarch32"
+    Aarch32sf = "aarch32sf"
+    Aarch32hf = "aarch32hf"
+    Ppc = "ppc"
+    Ppc64 = "ppc64"
+    Ppc64hf = "ppc64hf"
+    Ppc32 = "ppc32"
+    Ppc32spe = "ppc32spe"
+    Ppc32hf = "ppc32hf"
+    Sparc = "sparc"
+    Sparc32 = "sparc32"
+    Sparcv9 = "sparcv9"
+    Sparcv9_64 = "sparcv9-64"
+
+
+AZUL_API_BASE = "https://api.azul.com/metadata/v1"
+AZUL_API_PACKAGES = f"{AZUL_API_BASE}/zulu/packages/"
+AZUL_API_PACKAGE_DETAIL = f"{AZUL_API_BASE}/zulu/packages/{{package_uuid}}"
+
+
+class AzulApiPackagesQuery(APIQuery):
+    java_version: Optional[str] = None
+    os: Optional[AzulOsQueryParam] = None
+    arch: Optional[AzulArchQueryParam] = None
+    archive_type: Optional[AzulArchiveType] = None
+    java_package_type: Optional[AzulJavaPackageType] = None
+    javafx_bundled: Optional[bool] = None
+    crac_supported: Optional[bool] = None
+    support_term: Optional[AzulSupportTerm] = None
+    release_type: Optional[AzulReleaseType] = None
+    latest: Optional[bool] = None
+    distro_version: Optional[str] = None
+    java_package_features: list[str] = []
+    release_status: Optional[AzulReleaseStatus] = None
+    availability_types: list[AzulAvailabilityType] = []
+    certifications: list[AzulCertifications] = []
+    include_fields: list[str] = []
+    page: int = 0
+    page_size: int = 100
+
+
+def azulApiPackagesUrl(query: AzulApiPackagesQuery = AzulApiPackagesQuery()):
+    url = urlparse(AZUL_API_PACKAGES)
+    return urlunparse(url._replace(query=query.to_query()))
+
+
+def azulApiPackageDetailUrl(package_uuid: str):
+    return AZUL_API_PACKAGE_DETAIL.format(package_uuid=package_uuid)
+
+
+class ZuluSignatureDetail(MetaBase):
+    type: AzulSignatureType
+    url: str
+    details: dict[str, Any]
+    signature_index: int
+    signature: str
+
+
+class ZuluPackageDetail(MetaBase):
+    package_uuid: str
+    name: Optional[str]
+    md5_hash: Optional[str]
+    sha256_hash: Optional[str]
+    build_date: datetime
+    last_modified: datetime
+    download_url: str
+    product: AzulProduct
+    availability_type: AzulAvailabilityType
+    java_version: list[int]
+    openjdk_build_number: Optional[int]
+    java_package_type: AzulJavaPackageType
+    javafx_bundled: bool
+    release_type: AzulReleaseType
+    os: AzulOs
+    lib_c_type: Optional[AzulLibCType]
+    cpu_gen: Optional[list[AzulCPUGen]]
+    arch: AzulArch
+    hw_bitness: AzulHwBitness
+    abi: AzulAbi
+    archive_type: AzulArchiveType
+    release_status: AzulReleaseStatus
+    support_term: AzulSupportTerm
+    certifications: Optional[list[AzulCertifications]]
+    latest: Optional[bool]
+    size: int
+    distro_version: list[int]
+    signatures: list[ZuluSignatureDetail]
+
+
+class ZuluPackage(MetaBase):
+    package_uuid: str
+    name: Optional[str]
+    java_version: list[int]
+    openjdk_build_number: Optional[int]
+    latest: Optional[bool]
+    download_url: str
+    product: Optional[AzulProduct]
+    distro_version: list[int]
+    availability_type: Optional[AzulAvailabilityType]
+
+
+class ZuluPackageList(MetaBase):
+    __root__: list[ZuluPackage]
+
+    def __iter__(self) -> Generator[tuple[str, ZuluPackage], None, None]:
+        yield from ((str(i), val) for i, val in enumerate(self.__root__))
+
+    def __getitem__(self, item: int) -> ZuluPackage:
+        return self.__root__[item]
+
+    def append(self, pkg: ZuluPackage):
+        self.__root__.append(pkg)
+
+
+class ZuluPackagesDetail(MetaBase):
+    __root__: list[ZuluPackageDetail]
+
+    def __iter__(self) -> Generator[tuple[str, ZuluPackageDetail], None, None]:
+        yield from ((str(i), val) for i, val in enumerate(self.__root__))
+
+    def __getitem__(self, item: int) -> ZuluPackageDetail:
+        return self.__root__[item]
+
+    def append(self, pkg: ZuluPackageDetail):
+        self.__root__.append(pkg)
+
+
+MOJANG_OS_NAMES = ["mac-os", "linux", "windows"]
+
+MOJANG_OS_ARCHITECTURES = [
+    "x64",
+    "x86",
+    "arm64",
+    "arm32",
+]
diff --git a/meta/meta/model/liteloader.py b/meta/meta/model/liteloader.py
new file mode 100644
index 0000000000..64cdaadd7e
--- /dev/null
+++ b/meta/meta/model/liteloader.py
@@ -0,0 +1,112 @@
+from datetime import datetime
+from typing import Optional, List, Dict, Any
+
+from pydantic import Field
+
+from . import Library, MetaBase
+
+
+class LiteloaderDev(MetaBase):
+    fgVersion: Optional[str]
+    mappings: Optional[str]
+    mcp: Optional[str]
+
+
+class LiteloaderRepo(MetaBase):
+    """
+    "repo":{
+        "stream":"RELEASE",
+        "type":"m2",
+        "url":"http://dl.liteloader.com/repo/",
+        "classifier":""
+    },
+    """
+
+    stream: str
+    type: str
+    url: str
+    classifier: str
+
+
+class LiteloaderArtefact(MetaBase):
+    """
+    "53639d52340479ccf206a04f5e16606f":{
+        "tweakClass":"com.mumfrey.liteloader.launch.LiteLoaderTweaker",
+        "libraries":[
+            {
+                "name":"net.minecraft:launchwrapper:1.5"
+            },
+            {
+                "name":"net.sf.jopt-simple:jopt-simple:4.5"
+            },
+            {
+                "name":"org.ow2.asm:asm-all:4.1"
+            }
+        ],
+        "stream":"RELEASE",
+        "file":"liteloader-1.5.2_01.jar",
+        "version":"1.5.2_01",
+        "md5":"53639d52340479ccf206a04f5e16606f",
+        "timestamp":"1367366420"
+    },
+    """
+
+    tweakClass: str
+    libraries: List[Library]
+    stream: str
+    file: str
+    version: str
+    build: Optional[str]
+    md5: str
+    timestamp: str
+    srcJar: Optional[str]
+    mcpJar: Optional[str]
+    lastSuccessfulBuild: Optional[int]  # only for snapshots
+
+
+class LiteloaderArtefacts(MetaBase):
+    liteloader: Dict[str, LiteloaderArtefact] = Field(alias="com.mumfrey:liteloader")
+    libraries: Optional[List[Library]]
+
+
+class LiteloaderEntry(MetaBase):
+    """
+    "1.10.2":{
+        "dev": { ... },
+        "repo":{ ... },
+        "artefacts":{
+            "com.mumfrey:liteloader":{ },
+            ...
+        },
+        "snapshots":{
+            ...
+        }
+    """
+
+    dev: Optional[LiteloaderDev]
+    repo: LiteloaderRepo
+    artefacts: Optional[LiteloaderArtefacts]
+    snapshots: Optional[LiteloaderArtefacts]
+
+
+class LiteloaderMeta(MetaBase):
+    """
+    "meta":{
+        "description":"LiteLoader is a lightweight mod bootstrap designed to provide basic loader functionality for mods which don't need to modify game mechanics.",
+        "authors":"Mumfrey",
+        "url":"http://dl.liteloader.com",
+        "updated":"2017-02-22T11:34:07+00:00",
+        "updatedTime":1487763247
+    },
+    """
+
+    description: str
+    authors: str
+    url: str
+    updated: datetime
+    updated_time: int = Field(alias="updatedTime")
+
+
+class LiteloaderIndex(MetaBase):
+    meta: LiteloaderMeta
+    versions: Dict[Any, LiteloaderEntry]
diff --git a/meta/meta/model/mojang.py b/meta/meta/model/mojang.py
new file mode 100644
index 0000000000..b3edfe21f9
--- /dev/null
+++ b/meta/meta/model/mojang.py
@@ -0,0 +1,344 @@
+from datetime import datetime
+from typing import Optional, List, Dict, Any, Iterator
+from .enum import StrEnum
+
+from pydantic import validator, Field
+
+from . import (
+    MetaBase,
+    MojangArtifactBase,
+    MojangAssets,
+    MojangArtifact,
+    MojangLibraryDownloads,
+    MojangLogging,
+    Library,
+    MetaVersion,
+    GradleSpecifier,
+)
+
+SUPPORTED_LAUNCHER_VERSION = 21
+SUPPORTED_COMPLIANCE_LEVEL = 1
+DEFAULT_JAVA_MAJOR = 8  # By default, we should recommend Java 8 if we don't know better
+DEFAULT_JAVA_NAME = (
+    "jre-legacy"  # By default, we should recommend Java 8 if we don't know better
+)
+COMPATIBLE_JAVA_MAPPINGS = {16: [17]}
+SUPPORTED_FEATURES = ["is_quick_play_multiplayer", "is_quick_play_singleplayer"]
+
+"""
+Mojang index files look like this:
+{
+    "latest": {
+        "release": "1.11.2",
+        "snapshot": "17w06a"
+    },
+    "versions": [
+        ...
+        {
+            "id": "17w06a",
+            "releaseTime": "2017-02-08T13:16:29+00:00",
+            "time": "2017-02-08T13:17:20+00:00",
+            "type": "snapshot",
+            "url": "https://launchermeta.mojang.com/mc/game/7db0c61afa278d016cf1dae2fba0146edfbf2f8e/17w06a.json"
+        },
+        ...
+    ]
+}
+"""
+
+
+class MojangLatestVersion(MetaBase):
+    release: str
+    snapshot: str
+
+
+class MojangIndexEntry(MetaBase):
+    id: Optional[str]
+    release_time: Optional[datetime] = Field(alias="releaseTime")
+    time: Optional[datetime]
+    type: Optional[str]
+    url: Optional[str]
+    sha1: Optional[str]
+    compliance_level: Optional[int] = Field(alias="complianceLevel")
+
+
+class MojangIndex(MetaBase):
+    latest: MojangLatestVersion
+    versions: List[MojangIndexEntry]
+
+
+class MojangIndexWrap:
+    def __init__(self, index: MojangIndex):
+        self.index = index
+        self.latest = index.latest
+        self.versions = dict((x.id, x) for x in index.versions)
+
+
+class ExperimentEntry(MetaBase):
+    id: str
+    url: str
+    wiki: Optional[str]
+
+
+class ExperimentIndex(MetaBase):
+    experiments: List[ExperimentEntry]
+
+
+class ExperimentIndexWrap:
+    def __init__(self, index: ExperimentIndex):
+        self.index: ExperimentIndex = index
+        self.versions: Dict[str, ExperimentEntry] = dict(
+            (x.id, x) for x in index.experiments
+        )
+
+
+class OldSnapshotEntry(MetaBase):
+    id: str
+    url: str
+    wiki: Optional[str]
+    jar: str
+    sha1: str
+    size: int
+
+
+class OldSnapshotIndex(MetaBase):
+    old_snapshots: List[OldSnapshotEntry]
+
+
+class OldSnapshotIndexWrap:
+    def __init__(self, index: OldSnapshotIndex):
+        self.index: OldSnapshotIndex = index
+        self.versions: Dict[str, OldSnapshotEntry] = dict(
+            (x.id, x) for x in index.old_snapshots
+        )
+
+
+class LegacyOverrideEntry(MetaBase):
+    main_class: Optional[str] = Field(alias="mainClass")
+    applet_class: Optional[str] = Field(alias="appletClass")
+    release_time: Optional[datetime] = Field(alias="releaseTime")
+    additional_traits: Optional[List[str]] = Field(alias="+traits")
+    additional_jvm_args: Optional[List[str]] = Field(alias="+jvmArgs")
+
+    def apply_onto_meta_version(self, meta_version: MetaVersion, legacy: bool = True):
+        # simply hard override classes
+        meta_version.main_class = self.main_class
+        meta_version.applet_class = self.applet_class
+        # if we have an updated release time (more correct than Mojang), use it
+        if self.release_time:
+            meta_version.release_time = self.release_time
+
+        # add traits, if any
+        if self.additional_traits:
+            if not meta_version.additional_traits:
+                meta_version.additional_traits = []
+            meta_version.additional_traits += self.additional_traits
+
+        if self.additional_jvm_args:
+            if not meta_version.additional_jvm_args:
+                meta_version.additional_jvm_args = []
+            meta_version.additional_jvm_args += self.additional_jvm_args
+
+        if legacy:
+            # remove all libraries - they are not needed for legacy
+            meta_version.libraries = None
+
+
+class LegacyOverrideIndex(MetaBase):
+    versions: Dict[str, LegacyOverrideEntry]
+
+
+class LibraryPatch(MetaBase):
+    match: List[GradleSpecifier]
+    override: Optional[Library]
+    additionalLibraries: Optional[List[Library]]
+    patchAdditionalLibraries: bool = Field(False)
+
+    def applies(self, target: Library) -> bool:
+        return target.name in self.match
+
+
+class LibraryPatches(MetaBase):
+    __root__: List[LibraryPatch]
+
+    def __iter__(self) -> Iterator[LibraryPatch]:
+        return iter(self.__root__)
+
+    def __getitem__(self, item) -> LibraryPatch:
+        return self.__root__[item]
+
+
+class LegacyServices(MetaBase):
+    __root__: List[str]
+
+    def __iter__(self) -> Iterator[str]:
+        return iter(self.__root__)
+
+    def __getitem__(self, item) -> str:
+        return self.__root__[item]
+
+
+class MojangArguments(MetaBase):
+    game: Optional[List[Any]]  # mixture of strings and objects
+    jvm: Optional[List[Any]]
+
+
+class MojangJavaComponent(StrEnum):
+    JreLegacy = "jre-legacy"
+    Alpha = "java-runtime-alpha"
+    Beta = "java-runtime-beta"
+    Gamma = "java-runtime-gamma"
+    GammaSnapshot = "java-runtime-gamma-snapshot"
+    Exe = "minecraft-java-exe"
+    Delta = "java-runtime-delta"
+    Epsilon = "java-runtime-epsilon"
+
+
+class JavaVersion(MetaBase):
+    component: MojangJavaComponent = MojangJavaComponent.JreLegacy
+    major_version: int = Field(8, alias="majorVersion")
+
+
+class MojangJavaIndexAvailability(MetaBase):
+    group: int
+    progress: int
+
+
+class MojangJavaIndexManifest(MetaBase):
+    sha1: str
+    size: int
+    url: str
+
+
+class MojangJavaIndexVersion(MetaBase):
+    name: str
+    released: datetime
+
+
+class MojangJavaRuntime(MetaBase):
+    availability: MojangJavaIndexAvailability
+    manifest: MojangJavaIndexManifest
+    version: MojangJavaIndexVersion
+
+
+class MojangJavaIndexEntry(MetaBase):
+    __root__: dict[MojangJavaComponent, list[MojangJavaRuntime]]
+
+    def __iter__(self) -> Iterator[MojangJavaComponent]:
+        return iter(self.__root__)
+
+    def __getitem__(self, item) -> list[MojangJavaRuntime]:
+        return self.__root__[item]
+
+
+class MojangJavaOsName(StrEnum):
+    Gamecore = "gamecore"
+    Linux = "linux"
+    Linuxi386 = "linux-i386"
+    MacOs = "mac-os"
+    MacOSArm64 = "mac-os-arm64"
+    WindowsArm64 = "windows-arm64"
+    WindowsX64 = "windows-x64"
+    WindowsX86 = "windows-x86"
+
+
+class JavaIndex(MetaBase):
+    __root__: dict[MojangJavaOsName, MojangJavaIndexEntry]
+
+    def __iter__(self) -> Iterator[MojangJavaOsName]:
+        return iter(self.__root__)
+
+    def __getitem__(self, item) -> MojangJavaIndexEntry:
+        return self.__root__[item]
+
+
+class MojangVersion(MetaBase):
+    @validator("minimum_launcher_version")
+    def validate_minimum_launcher_version(cls, v):
+        assert v <= SUPPORTED_LAUNCHER_VERSION
+        return v
+
+    @validator("compliance_level")
+    def validate_compliance_level(cls, v):
+        assert v <= SUPPORTED_COMPLIANCE_LEVEL
+        return v
+
+    id: str  # TODO: optional?
+    arguments: Optional[MojangArguments]
+    asset_index: Optional[MojangAssets] = Field(alias="assetIndex")
+    assets: Optional[str]
+    downloads: Optional[Dict[str, MojangArtifactBase]]  # TODO improve this?
+    libraries: Optional[List[Library]]  # TODO: optional?
+    main_class: Optional[str] = Field(alias="mainClass")
+    applet_class: Optional[str] = Field(alias="appletClass")
+    processArguments: Optional[str]
+    minecraft_arguments: Optional[str] = Field(alias="minecraftArguments")
+    minimum_launcher_version: Optional[int] = Field(alias="minimumLauncherVersion")
+    release_time: Optional[datetime] = Field(alias="releaseTime")
+    time: Optional[datetime]
+    type: Optional[str]
+    inherits_from: Optional[str] = Field("inheritsFrom")
+    logging: Optional[Dict[str, MojangLogging]]  # TODO improve this?
+    compliance_level: Optional[int] = Field(alias="complianceLevel")
+    javaVersion: Optional[JavaVersion]
+
+    def to_meta_version(self, name: str, uid: str, version: str) -> MetaVersion:
+        main_jar = None
+        addn_traits = None
+        new_type = self.type
+        compatible_java_majors = None
+        if self.id:
+            client_download = self.downloads["client"]
+            artifact = MojangArtifact(
+                url=client_download.url,
+                sha1=client_download.sha1,
+                size=client_download.size,
+            )
+            downloads = MojangLibraryDownloads(artifact=artifact)
+            main_jar = Library(
+                name=GradleSpecifier("com.mojang", "minecraft", self.id, "client"),
+                downloads=downloads,
+            )
+
+        if not self.compliance_level:  # both == 0 and is None
+            pass
+        elif self.compliance_level == 1:
+            if not addn_traits:
+                addn_traits = []
+            addn_traits.append("XR:Initial")
+        else:
+            raise Exception(f"Unsupported compliance level {self.compliance_level}")
+
+        major = DEFAULT_JAVA_MAJOR
+        javaName = DEFAULT_JAVA_NAME
+        if (
+            self.javaVersion is not None
+        ):  # some versions don't have this. TODO: maybe maintain manual overrides
+            major = self.javaVersion.major_version
+            javaName = self.javaVersion.component
+
+        compatible_java_majors = [major]
+        if (
+            major in COMPATIBLE_JAVA_MAPPINGS
+        ):  # add more compatible Java versions, e.g. 16 and 17 both work for MC 1.17
+            compatible_java_majors += COMPATIBLE_JAVA_MAPPINGS[major]
+
+        if new_type == "pending":  # experiments from upstream are type=pending
+            new_type = "experiment"
+
+        return MetaVersion(
+            name=name,
+            uid=uid,
+            version=version,
+            asset_index=self.asset_index,
+            libraries=self.libraries,
+            main_class=self.main_class,
+            minecraft_arguments=self.minecraft_arguments,
+            release_time=self.release_time,
+            type=new_type,
+            compatible_java_majors=compatible_java_majors,
+            compatible_java_name=javaName,
+            additional_traits=addn_traits,
+            main_jar=main_jar,
+            logging=(self.logging or {}).get("client"),
+        )
diff --git a/meta/meta/model/neoforge.py b/meta/meta/model/neoforge.py
new file mode 100644
index 0000000000..ccdb325a23
--- /dev/null
+++ b/meta/meta/model/neoforge.py
@@ -0,0 +1,241 @@
+from datetime import datetime
+from typing import Optional, List, Dict
+
+from pydantic import Field
+
+from . import MetaBase, GradleSpecifier, Library
+from .mojang import MojangVersion
+
+
+class NeoForgeFile(MetaBase):
+    artifact: str
+    classifier: str
+    extension: str
+
+    def filename(self, long_version):
+        return "%s-%s-%s.%s" % (
+            self.artifact,
+            long_version,
+            self.classifier,
+            self.extension,
+        )
+
+    def url(self, long_version):
+        return "https://maven.neoforged.net/releases/net/neoforged/%s/%s/%s" % (
+            self.artifact,
+            long_version,
+            self.filename(long_version),
+        )
+
+
+class NeoForgeEntry(MetaBase):
+    artifact: str
+    long_version: str = Field(alias="longversion")
+    version: str
+    latest: Optional[bool]
+    recommended: Optional[bool]
+    files: Optional[Dict[str, NeoForgeFile]]
+
+
+class NeoForgeMCVersionInfo(MetaBase):
+    latest: Optional[str]
+    recommended: Optional[str]
+    versions: List[str] = Field([])
+
+
+class DerivedNeoForgeIndex(MetaBase):
+    versions: Dict[str, NeoForgeEntry] = Field({})
+
+
+class FMLLib(
+    MetaBase
+):  # old ugly stuff. Maybe merge this with Library or Library later
+    filename: str
+    checksum: str
+    ours: bool
+
+
+class NeoForgeInstallerProfileInstallSection(MetaBase):
+    """
+    "install": {
+        "profileName": "NeoForge",
+        "target":"NeoForge8.9.0.753",
+        "path":"net.minecraftNeoForge:minecraftNeoForge:8.9.0.753",
+        "version":"NeoForge 8.9.0.753",
+        "filePath":"minecraftNeoForge-universal-1.6.1-8.9.0.753.jar",
+        "welcome":"Welcome to the simple NeoForge installer.",
+        "minecraft":"1.6.1",
+        "logo":"/big_logo.png",
+        "mirrorList": "http://files.minecraftNeoForge.net/mirror-brand.list"
+    },
+    "install": {
+        "profileName": "NeoForge",
+        "target":"1.11-NeoForge1.11-13.19.0.2141",
+        "path":"net.minecraftNeoForge:NeoForge:1.11-13.19.0.2141",
+        "version":"NeoForge 1.11-13.19.0.2141",
+        "filePath":"NeoForge-1.11-13.19.0.2141-universal.jar",
+        "welcome":"Welcome to the simple NeoForge installer.",
+        "minecraft":"1.11",
+        "mirrorList" : "http://files.minecraftNeoForge.net/mirror-brand.list",
+        "logo":"/big_logo.png",
+        "modList":"none"
+    },
+    """
+
+    profile_name: str = Field(alias="profileName")
+    target: str
+    path: GradleSpecifier
+    version: str
+    file_path: str = Field(alias="filePath")
+    welcome: str
+    minecraft: str
+    logo: str
+    mirror_list: str = Field(alias="mirrorList")
+    mod_list: Optional[str] = Field(alias="modList")
+
+
+class NeoForgeLibrary(Library):
+    url: Optional[str]
+    server_req: Optional[bool] = Field(alias="serverreq")
+    client_req: Optional[bool] = Field(alias="clientreq")
+    checksums: Optional[List[str]]
+    comment: Optional[str]
+
+
+class NeoForgeVersionFile(MojangVersion):
+    libraries: Optional[List[NeoForgeLibrary]]  # overrides Mojang libraries
+    inherits_from: Optional[str] = Field("inheritsFrom")
+    jar: Optional[str]
+
+
+class NeoForgeOptional(MetaBase):
+    """
+    "optionals": [
+        {
+            "name": "Mercurius",
+            "client": true,
+            "server": true,
+            "default": true,
+            "inject": true,
+            "desc": "A mod that collects statistics about Minecraft and your system.<br>Useful for NeoForge to understand how Minecraft/NeoForge are used.",
+            "url": "http://www.minecraftNeoForge.net/forum/index.php?topic=43278.0",
+            "artifact": "net.minecraftNeoForge:MercuriusUpdater:1.11.2",
+            "maven": "http://maven.minecraftNeoForge.net/"
+        }
+    ]
+    """
+
+    name: Optional[str]
+    client: Optional[bool]
+    server: Optional[bool]
+    default: Optional[bool]
+    inject: Optional[bool]
+    desc: Optional[str]
+    url: Optional[str]
+    artifact: Optional[GradleSpecifier]
+    maven: Optional[str]
+
+
+class DataSpec(MetaBase):
+    client: Optional[str]
+    server: Optional[str]
+
+
+class ProcessorSpec(MetaBase):
+    jar: Optional[str]
+    classpath: Optional[List[str]]
+    args: Optional[List[str]]
+    outputs: Optional[Dict[str, str]]
+    sides: Optional[List[str]]
+
+
+class NeoForgeInstallerProfileV2(MetaBase):
+    _comment: Optional[List[str]]
+    spec: Optional[int]
+    profile: Optional[str]
+    version: Optional[str]
+    icon: Optional[str]
+    json_data: Optional[str] = Field(alias="json")
+    path: Optional[GradleSpecifier]
+    logo: Optional[str]
+    minecraft: Optional[str]
+    welcome: Optional[str]
+    data: Optional[Dict[str, DataSpec]]
+    processors: Optional[List[ProcessorSpec]]
+    libraries: Optional[List[Library]]
+    mirror_list: Optional[str] = Field(alias="mirrorList")
+    server_jar_path: Optional[str] = Field(alias="serverJarPath")
+
+
+class InstallerInfo(MetaBase):
+    sha1hash: Optional[str]
+    sha256hash: Optional[str]
+    size: Optional[int]
+
+
+# A post-processed entry constructed from the reconstructed NeoForge version index
+class NeoForgeVersion:
+    def __init__(self, entry: NeoForgeEntry):
+        self.artifact = entry.artifact
+        self.rawVersion = entry.version
+        if self.artifact == "neoforge":
+            self.rawVersion = entry.long_version
+
+        self.installer_filename = None
+        self.installer_url = None
+        self.universal_filename = None
+        self.universal_url = None
+        self.changelog_url = None
+        self.long_version = entry.long_version
+
+        # this comment's whole purpose is to say this: cringe
+        for classifier, file in entry.files.items():
+            extension = file.extension
+            filename = file.filename(self.long_version)
+            url = file.url(self.long_version)
+            print(url)
+            print(self.long_version)
+            if (classifier == "installer") and (extension == "jar"):
+                self.installer_filename = filename
+                self.installer_url = url
+            if (classifier == "universal" or classifier == "client") and (
+                extension == "jar" or extension == "zip"
+            ):
+                self.universal_filename = filename
+                self.universal_url = url
+            if (classifier == "changelog") and (extension == "txt"):
+                self.changelog_url = url
+
+    def name(self):
+        return "neoforge %d" % self.build
+
+    def uses_installer(self):
+        return self.installer_url is not None
+
+    def filename(self):
+        if self.uses_installer():
+            return self.installer_filename
+        return self.universal_filename
+
+    def url(self):
+        if self.uses_installer():
+            return self.installer_url
+        return self.universal_url
+
+    def is_supported(self):
+        if self.url() is None:
+            return False
+
+        foo = self.rawVersion.split(".")
+        if len(foo) < 1:
+            return False
+
+        major_version = foo[0]
+        if not major_version.isnumeric():
+            return False
+
+        # majorVersion = int(majorVersionStr)
+        # if majorVersion >= 37:
+        #    return False
+
+        return True
diff --git a/meta/meta/run/__init__.py b/meta/meta/run/__init__.py
new file mode 100644
index 0000000000..1bfe4f9ac8
--- /dev/null
+++ b/meta/meta/run/__init__.py
@@ -0,0 +1 @@
+"""Main scripts"""
diff --git a/meta/meta/run/generate_fabric.py b/meta/meta/run/generate_fabric.py
new file mode 100755
index 0000000000..7ca50dd6aa
--- /dev/null
+++ b/meta/meta/run/generate_fabric.py
@@ -0,0 +1,143 @@
+import json
+import os
+
+from meta.common import (
+    ensure_component_dir,
+    launcher_path,
+    upstream_path,
+    transform_maven_key,
+)
+from meta.common.fabric import (
+    JARS_DIR,
+    INSTALLER_INFO_DIR,
+    META_DIR,
+    INTERMEDIARY_COMPONENT,
+    LOADER_COMPONENT,
+)
+from meta.model import MetaVersion, Dependency, Library, MetaPackage, GradleSpecifier
+from meta.model.fabric import FabricJarInfo, FabricInstallerDataV1, FabricMainClasses
+
+LAUNCHER_DIR = launcher_path()
+UPSTREAM_DIR = upstream_path()
+
+ensure_component_dir(LOADER_COMPONENT)
+ensure_component_dir(INTERMEDIARY_COMPONENT)
+
+
+def load_jar_info(artifact_key) -> FabricJarInfo:
+    return FabricJarInfo.parse_file(
+        os.path.join(UPSTREAM_DIR, JARS_DIR, f"{artifact_key}.json")
+    )
+
+
+def load_installer_info(version) -> FabricInstallerDataV1:
+    return FabricInstallerDataV1.parse_file(
+        os.path.join(UPSTREAM_DIR, INSTALLER_INFO_DIR, f"{version}.json")
+    )
+
+
+def process_loader_version(entry) -> MetaVersion:
+    jar_info = load_jar_info(transform_maven_key(entry["maven"]))
+    installer_info = load_installer_info(entry["version"])
+
+    v = MetaVersion(
+        name="Fabric Loader", uid="net.fabricmc.fabric-loader", version=entry["version"]
+    )
+    v.release_time = jar_info.release_time
+    v.requires = [Dependency(uid="net.fabricmc.intermediary")]
+    v.order = 10
+    v.type = "release"
+    if isinstance(installer_info.main_class, FabricMainClasses):
+        v.main_class = installer_info.main_class.client
+    else:
+        v.main_class = installer_info.main_class
+    v.libraries = []
+    v.libraries.extend(installer_info.libraries.common)
+    v.libraries.extend(installer_info.libraries.client)
+    loader_lib = Library(
+        name=GradleSpecifier.from_string(entry["maven"]),
+        url="https://maven.fabricmc.net",
+    )
+    v.libraries.append(loader_lib)
+    return v
+
+
+def process_intermediary_version(entry) -> MetaVersion:
+    jar_info = load_jar_info(transform_maven_key(entry["maven"]))
+
+    v = MetaVersion(
+        name="Intermediary Mappings",
+        uid="net.fabricmc.intermediary",
+        version=entry["version"],
+    )
+    v.release_time = jar_info.release_time
+    v.requires = [Dependency(uid="net.minecraft", equals=entry["version"])]
+    v.order = 11
+    v.type = "release"
+    v.libraries = []
+    v.volatile = True
+    intermediary_lib = Library(
+        name=GradleSpecifier.from_string(entry["maven"]),
+        url="https://maven.fabricmc.net",
+    )
+    v.libraries.append(intermediary_lib)
+    return v
+
+
+def main():
+    recommended_loader_versions = []
+    recommended_intermediary_versions = []
+
+    with open(
+        os.path.join(UPSTREAM_DIR, META_DIR, "loader.json"), "r", encoding="utf-8"
+    ) as f:
+        loader_version_index = json.load(f)
+        for entry in loader_version_index:
+            version = entry["version"]
+            print(f"Processing loader {version}")
+
+            v = process_loader_version(entry)
+
+            # Fabric Meta has a separate "stable" field, let's use that
+            if not recommended_loader_versions and entry["stable"]:
+                recommended_loader_versions.append(version)
+
+            v.write(os.path.join(LAUNCHER_DIR, LOADER_COMPONENT, f"{v.version}.json"))
+
+    with open(
+        os.path.join(UPSTREAM_DIR, META_DIR, "intermediary.json"), "r", encoding="utf-8"
+    ) as f:
+        intermediary_version_index = json.load(f)
+        for entry in intermediary_version_index:
+            version = entry["version"]
+            print(f"Processing intermediary {version}")
+
+            v = process_intermediary_version(entry)
+
+            recommended_intermediary_versions.append(
+                version
+            )  # all intermediaries are recommended
+
+            v.write(
+                os.path.join(LAUNCHER_DIR, INTERMEDIARY_COMPONENT, f"{v.version}.json")
+            )
+
+    package = MetaPackage(uid=LOADER_COMPONENT, name="Fabric Loader")
+    package.recommended = recommended_loader_versions
+    package.description = (
+        "Fabric Loader is a tool to load Fabric-compatible mods in game environments."
+    )
+    package.project_url = "https://fabricmc.net"
+    package.authors = ["Fabric Developers"]
+    package.write(os.path.join(LAUNCHER_DIR, LOADER_COMPONENT, "package.json"))
+
+    package = MetaPackage(uid=INTERMEDIARY_COMPONENT, name="Intermediary Mappings")
+    package.recommended = recommended_intermediary_versions
+    package.description = "Intermediary mappings allow using Fabric Loader with mods for Minecraft in a more compatible manner."
+    package.project_url = "https://fabricmc.net"
+    package.authors = ["Fabric Developers"]
+    package.write(os.path.join(LAUNCHER_DIR, INTERMEDIARY_COMPONENT, "package.json"))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/meta/meta/run/generate_forge.py b/meta/meta/run/generate_forge.py
new file mode 100755
index 0000000000..a01f503ebe
--- /dev/null
+++ b/meta/meta/run/generate_forge.py
@@ -0,0 +1,467 @@
+import os
+import re
+from packaging import version as pversion
+from operator import attrgetter
+from typing import Collection
+
+from meta.common import ensure_component_dir, launcher_path, upstream_path, eprint
+from meta.common.forge import (
+    FORGE_COMPONENT,
+    INSTALLER_MANIFEST_DIR,
+    VERSION_MANIFEST_DIR,
+    DERIVED_INDEX_FILE,
+    LEGACYINFO_FILE,
+    INSTALLER_INFO_DIR,
+    BAD_VERSIONS,
+    FORGEWRAPPER_LIBRARY,
+)
+from meta.common.mojang import MINECRAFT_COMPONENT
+from meta.model import (
+    MetaVersion,
+    Dependency,
+    Library,
+    GradleSpecifier,
+    MojangLibraryDownloads,
+    MojangArtifact,
+    MetaPackage,
+)
+from meta.model.forge import (
+    ForgeVersion,
+    ForgeInstallerProfile,
+    ForgeLegacyInfo,
+    fml_libs_for_version,
+    ForgeInstallerProfileV2,
+    InstallerInfo,
+    DerivedForgeIndex,
+    ForgeLegacyInfoList,
+)
+from meta.model.mojang import MojangVersion
+
+LAUNCHER_DIR = launcher_path()
+UPSTREAM_DIR = upstream_path()
+
+ensure_component_dir(FORGE_COMPONENT)
+
+
+# Construct a set of libraries out of a Minecraft version file, for filtering.
+mc_version_cache = {}
+
+
+def load_mc_version_filter(version: str):
+    if version in mc_version_cache:
+        return mc_version_cache[version]
+    v = MetaVersion.parse_file(
+        os.path.join(LAUNCHER_DIR, MINECRAFT_COMPONENT, f"{version}.json")
+    )
+    libs = set(map(attrgetter("name"), v.libraries))
+    mc_version_cache[version] = libs
+    return libs
+
+
+"""
+Match a library coordinate to a set of library coordinates.
+ * Block those that pass completely.
+ * For others, block those with lower versions than in the set.
+"""
+
+
+def should_ignore_artifact(libs: Collection[GradleSpecifier], match: GradleSpecifier):
+    for ver in libs:
+        if (
+            ver.group == match.group
+            and ver.artifact == match.artifact
+            and ver.classifier == match.classifier
+        ):
+            if ver.version == match.version:
+                # Everything is matched perfectly - this one will be ignored
+                return True
+            elif pversion.parse(ver.version) > pversion.parse(match.version):
+                return True
+            else:
+                # Otherwise it did not match - new version is higher and this is an upgrade
+                return False
+    # No match found in the set - we need to keep this
+    return False
+
+
+def version_from_profile(
+    profile: ForgeInstallerProfile, version: ForgeVersion
+) -> MetaVersion:
+    v = MetaVersion(name="Forge", version=version.rawVersion, uid=FORGE_COMPONENT)
+    mc_version = profile.install.minecraft
+    v.requires = [Dependency(uid=MINECRAFT_COMPONENT, equals=mc_version)]
+    v.main_class = profile.version_info.main_class
+    v.release_time = profile.version_info.time
+
+    args = profile.version_info.minecraft_arguments
+    tweakers = []
+    expression = re.compile(r"--tweakClass ([a-zA-Z0-9.]+)")
+    match = expression.search(args)
+    while match is not None:
+        tweakers.append(match.group(1))
+        args = args[: match.start()] + args[match.end() :]
+        match = expression.search(args)
+    if len(tweakers) > 0:
+        args = args.strip()
+        v.additional_tweakers = tweakers
+    # v.minecraftArguments = args
+
+    v.libraries = []
+    mc_filter = load_mc_version_filter(mc_version)
+    for forge_lib in profile.version_info.libraries:
+        if (
+            forge_lib.name.is_lwjgl()
+            or forge_lib.name.is_log4j()
+            or should_ignore_artifact(mc_filter, forge_lib.name)
+        ):
+            continue
+
+        overridden_name = forge_lib.name
+        if overridden_name.group == "net.minecraftforge":
+            if overridden_name.artifact == "minecraftforge":
+                overridden_name.artifact = "forge"
+                overridden_name.version = "%s-%s" % (
+                    mc_version,
+                    overridden_name.version,
+                )
+
+                overridden_name.classifier = "universal"
+            elif overridden_name.artifact == "forge":
+                overridden_name.classifier = "universal"
+
+        overridden_lib = Library(name=overridden_name)
+        if forge_lib.url == "http://maven.minecraftforge.net/":
+            overridden_lib.url = "https://maven.minecraftforge.net/"
+        else:
+            overridden_lib.url = forge_lib.url
+        # if forge_lib.checksums and len(forge_lib.checksums) == 2:
+        #    overridden_lib.mmcHint = "forge-pack-xz"
+        v.libraries.append(overridden_lib)
+
+    v.order = 5
+    return v
+
+
+def version_from_modernized_installer(
+    installer: MojangVersion, version: ForgeVersion
+) -> MetaVersion:
+    v = MetaVersion(name="Forge", version=version.rawVersion, uid=FORGE_COMPONENT)
+    mc_version = version.mc_version
+    v.requires = [Dependency(uid=MINECRAFT_COMPONENT, equals=mc_version)]
+    v.main_class = installer.main_class
+    v.release_time = installer.release_time
+
+    args = installer.minecraft_arguments
+    tweakers = []
+    expression = re.compile("--tweakClass ([a-zA-Z0-9.]+)")
+    match = expression.search(args)
+    while match is not None:
+        tweakers.append(match.group(1))
+        args = args[: match.start()] + args[match.end() :]
+        match = expression.search(args)
+    if len(tweakers) > 0:
+        args = args.strip()
+        v.additional_tweakers = tweakers
+    # v.minecraftArguments = args
+
+    v.libraries = []
+
+    mc_filter = load_mc_version_filter(mc_version)
+    for forge_lib in installer.libraries:
+        if (
+            forge_lib.name.is_lwjgl()
+            or forge_lib.name.is_log4j()
+            or should_ignore_artifact(mc_filter, forge_lib.name)
+        ):
+            continue
+
+        if forge_lib.name.group == "net.minecraftforge":
+            if forge_lib.name.artifact == "forge":
+                overridden_name = forge_lib.name
+                overridden_name.classifier = "universal"
+                forge_lib.downloads.artifact.path = overridden_name.path()
+                forge_lib.downloads.artifact.url = (
+                    "https://maven.minecraftforge.net/%s" % overridden_name.path()
+                )
+                forge_lib.name = overridden_name
+
+            elif forge_lib.name.artifact == "minecraftforge":
+                overridden_name = forge_lib.name
+                overridden_name.artifact = "forge"
+                overridden_name.classifier = "universal"
+                overridden_name.version = "%s-%s" % (
+                    mc_version,
+                    overridden_name.version,
+                )
+                forge_lib.downloads.artifact.path = overridden_name.path()
+                forge_lib.downloads.artifact.url = (
+                    "https://maven.minecraftforge.net/%s" % overridden_name.path()
+                )
+                forge_lib.name = overridden_name
+
+        v.libraries.append(forge_lib)
+
+    v.order = 5
+    return v
+
+
+def version_from_legacy(info: ForgeLegacyInfo, version: ForgeVersion) -> MetaVersion:
+    v = MetaVersion(name="Forge", version=version.rawVersion, uid=FORGE_COMPONENT)
+    mc_version = version.mc_version_sane
+    v.requires = [Dependency(uid=MINECRAFT_COMPONENT, equals=mc_version)]
+    v.release_time = info.release_time
+    v.order = 5
+    if fml_libs_for_version(
+        mc_version
+    ):  # WHY, WHY DID I WASTE MY TIME REWRITING FMLLIBSMAPPING
+        v.additional_traits = ["legacyFML"]
+
+    classifier = "client"
+    if "universal" in version.url():
+        classifier = "universal"
+
+    main_mod = Library(
+        name=GradleSpecifier(
+            "net.minecraftforge", "forge", version.long_version, classifier
+        )
+    )
+    main_mod.downloads = MojangLibraryDownloads()
+    main_mod.downloads.artifact = MojangArtifact(
+        url=version.url(), sha1=info.sha1, size=info.size
+    )
+    main_mod.downloads.artifact.path = None
+    v.jar_mods = [main_mod]
+    return v
+
+
+def version_from_build_system_installer(
+    installer: MojangVersion, profile: ForgeInstallerProfileV2, version: ForgeVersion
+) -> MetaVersion:
+    v = MetaVersion(name="Forge", version=version.rawVersion, uid=FORGE_COMPONENT)
+    v.requires = [Dependency(uid=MINECRAFT_COMPONENT, equals=version.mc_version_sane)]
+    v.main_class = "io.github.zekerzhayard.forgewrapper.installer.Main"
+
+    # FIXME: Add the size and hash here
+    v.maven_files = []
+
+    # load the locally cached installer file info and use it to add the installer entry in the json
+    info = InstallerInfo.parse_file(
+        os.path.join(UPSTREAM_DIR, INSTALLER_INFO_DIR, f"{version.long_version}.json")
+    )
+    installer_lib = Library(
+        name=GradleSpecifier(
+            "net.minecraftforge", "forge", version.long_version, "installer"
+        )
+    )
+    installer_lib.downloads = MojangLibraryDownloads()
+    installer_lib.downloads.artifact = MojangArtifact(
+        url="https://maven.minecraftforge.net/%s" % (installer_lib.name.path()),
+        sha1=info.sha1hash,
+        size=info.size,
+    )
+    v.maven_files.append(installer_lib)
+
+    for forge_lib in profile.libraries:
+        if forge_lib.name.is_log4j():
+            continue
+
+        if (
+            forge_lib.name.group == "net.minecraftforge"
+            and forge_lib.name.artifact == "forge"
+            and forge_lib.name.classifier == "universal"
+        ):
+            forge_lib.downloads.artifact.url = (
+                "https://maven.minecraftforge.net/%s" % forge_lib.name.path()
+            )
+        v.maven_files.append(forge_lib)
+
+    v.libraries = []
+
+    v.libraries.append(FORGEWRAPPER_LIBRARY)
+
+    for forge_lib in installer.libraries:
+        if forge_lib.name.is_log4j():
+            continue
+
+        if forge_lib.name.group == "net.minecraftforge":
+            if forge_lib.name.artifact == "forge" and not forge_lib.name.classifier:
+                forge_lib.name.classifier = "launcher"
+                forge_lib.downloads.artifact.path = forge_lib.name.path()
+                forge_lib.downloads.artifact.url = (
+                    "https://maven.minecraftforge.net/%s" % forge_lib.name.path()
+                )
+                forge_lib.name = forge_lib.name
+            # net.minecraftforge.forge:client doesn't exist??? (49.0.x)
+            if not len(forge_lib.downloads.artifact.url):
+                continue
+        v.libraries.append(forge_lib)
+
+    v.release_time = installer.release_time
+    v.order = 5
+    mc_args = (
+        "--username ${auth_player_name} --version ${version_name} --gameDir ${game_directory} "
+        "--assetsDir ${assets_root} --assetIndex ${assets_index_name} --uuid ${auth_uuid} "
+        "--accessToken ${auth_access_token} --userType ${user_type} --versionType ${version_type}"
+    )
+    for arg in installer.arguments.game:
+        mc_args += f" {arg}"
+    if "--fml.forgeGroup" not in installer.arguments.game:
+        mc_args += f" --fml.forgeGroup net.minecraftforge"
+    if "--fml.forgeVersion" not in installer.arguments.game:
+        mc_args += f" --fml.forgeVersion {version.rawVersion}"
+    if "--fml.mcVersion" not in installer.arguments.game:
+        mc_args += f" --fml.mcVersion {version.mc_version}"
+    v.minecraft_arguments = mc_args
+    return v
+
+
+def main():
+    # load the locally cached version list
+    remote_versions = DerivedForgeIndex.parse_file(
+        os.path.join(UPSTREAM_DIR, DERIVED_INDEX_FILE)
+    )
+    recommended_versions = []
+
+    legacy_info_list = ForgeLegacyInfoList.parse_file(
+        os.path.join(UPSTREAM_DIR, LEGACYINFO_FILE)
+    )
+    legacy_versions = [
+        "1.1",
+        "1.2.3",
+        "1.2.4",
+        "1.2.5",
+        "1.3.2",
+        "1.4.1",
+        "1.4.2",
+        "1.4.3",
+        "1.4.4",
+        "1.4.5",
+        "1.4.6",
+        "1.4.7",
+        "1.5",
+        "1.5.1",
+        "1.5.2",
+        "1.6.1",
+        "1.6.2",
+        "1.6.3",
+        "1.6.4",
+        "1.7.10",
+        "1.7.10-pre4",
+        "1.7.2",
+        "1.8",
+        "1.8.8",
+        "1.8.9",
+        "1.9",
+        "1.9.4",
+        "1.10",
+        "1.10.2",
+        "1.11",
+        "1.11.2",
+        "1.12",
+        "1.12.1",
+        "1.12.2",
+    ]
+
+    for key, entry in remote_versions.versions.items():
+        if entry.mc_version is None:
+            eprint("Skipping %s with invalid MC version" % key)
+            continue
+
+        version = ForgeVersion(entry)
+
+        if version.long_version in BAD_VERSIONS:
+            # Version 1.12.2-14.23.5.2851 is ultra cringe, I can't imagine why you would even spend one second on
+            # actually adding support for this version.
+            # It is cringe, because it's installer info is broken af
+            eprint(f"Skipping bad version {version.long_version}")
+            continue
+
+        if version.url() is None:
+            eprint("Skipping %s with no valid files" % key)
+            continue
+        eprint("Processing Forge %s" % version.rawVersion)
+        version_elements = version.rawVersion.split(".")
+        if len(version_elements) < 1:
+            eprint("Skipping version %s with not enough version elements" % key)
+            continue
+
+        major_version_str = version_elements[0]
+        if not major_version_str.isnumeric():
+            eprint(
+                "Skipping version %s with non-numeric major version %s"
+                % (key, major_version_str)
+            )
+            continue
+
+        if entry.recommended:
+            recommended_versions.append(version.rawVersion)
+
+        # If we do not have the corresponding Minecraft version, we ignore it
+        if not os.path.isfile(
+            os.path.join(
+                LAUNCHER_DIR, MINECRAFT_COMPONENT, f"{version.mc_version_sane}.json"
+            )
+        ):
+            eprint(
+                "Skipping %s with no corresponding Minecraft version %s"
+                % (key, version.mc_version_sane)
+            )
+            continue
+
+        # Path for new-style build system based installers
+        installer_version_filepath = os.path.join(
+            UPSTREAM_DIR, VERSION_MANIFEST_DIR, f"{version.long_version}.json"
+        )
+        profile_filepath = os.path.join(
+            UPSTREAM_DIR, INSTALLER_MANIFEST_DIR, f"{version.long_version}.json"
+        )
+
+        eprint(installer_version_filepath)
+        if os.path.isfile(installer_version_filepath):
+            installer = MojangVersion.parse_file(installer_version_filepath)
+            if entry.mc_version in legacy_versions:
+                v = version_from_modernized_installer(installer, version)
+            else:
+                profile = ForgeInstallerProfileV2.parse_file(profile_filepath)
+                v = version_from_build_system_installer(installer, profile, version)
+        else:
+            if version.uses_installer():
+                # If we do not have the Forge json, we ignore this version
+                if not os.path.isfile(profile_filepath):
+                    eprint("Skipping %s with missing profile json" % key)
+                    continue
+                profile = ForgeInstallerProfile.parse_file(profile_filepath)
+                v = version_from_profile(profile, version)
+            else:
+                # Generate json for legacy here
+                if version.mc_version_sane == "1.6.1":
+                    continue
+                build = version.build
+                if (
+                    str(build).encode("utf-8").decode("utf8")
+                    not in legacy_info_list.number
+                ):
+                    eprint(
+                        "Legacy build %d is missing in legacy info. Ignoring." % build
+                    )
+                    continue
+
+                v = version_from_legacy(legacy_info_list.number[str(build)], version)
+
+        v.write(os.path.join(LAUNCHER_DIR, FORGE_COMPONENT, f"{v.version}.json"))
+
+        recommended_versions.sort()
+
+        print("Recommended versions:", recommended_versions)
+
+        package = MetaPackage(
+            uid=FORGE_COMPONENT,
+            name="Forge",
+            project_url="https://www.minecraftforge.net/forum/",
+        )
+        package.recommended = recommended_versions
+        package.write(os.path.join(LAUNCHER_DIR, FORGE_COMPONENT, "package.json"))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/meta/meta/run/generate_java.py b/meta/meta/run/generate_java.py
new file mode 100644
index 0000000000..9f23e3a4d3
--- /dev/null
+++ b/meta/meta/run/generate_java.py
@@ -0,0 +1,537 @@
+import copy
+import datetime
+import os
+from typing import Optional
+from functools import reduce
+
+from meta.common import ensure_component_dir, launcher_path, upstream_path
+
+from meta.common.java import (
+    JAVA_MINECRAFT_COMPONENT,
+    JAVA_ADOPTIUM_COMPONENT,
+    JAVA_OPENJ9_COMPONENT,
+    JAVA_AZUL_COMPONENT,
+    ADOPTIUM_DIR,
+    ADOPTIUM_VERSIONS_DIR,
+    OPENJ9_DIR,
+    OPENJ9_VERSIONS_DIR,
+    AZUL_DIR,
+    AZUL_VERSIONS_DIR,
+)
+from meta.model import MetaPackage
+from meta.model.java import (
+    JavaRuntimeOS,
+    JavaRuntimeVersion,
+    JavaRuntimeMeta,
+    JavaVersionMeta,
+    JavaPackageType,
+    JavaChecksumMeta,
+    JavaChecksumType,
+    JavaRuntimeDownloadType,
+    AdoptxAvailableReleases,
+    AdoptxReleases,
+    AdoptxRelease,
+    AdoptxImageType,
+    AdoptxBinary,
+    ZuluPackageList,
+    ZuluPackageDetail,
+    AzulJavaPackageType,
+    AzulArch,
+)
+
+from meta.common.mojang import (
+    JAVA_MANIFEST_FILE,
+)
+
+from meta.model.mojang import (
+    JavaIndex,
+    MojangJavaComponent,
+    MojangJavaOsName,
+    MojangJavaRuntime,
+)
+
+LAUNCHER_DIR = launcher_path()
+UPSTREAM_DIR = upstream_path()
+
+
+MOJANG_OS_ARCHITECTURES = [
+    "x64",
+    "x86",
+    "arm64",
+    "arm32",
+    "riscv64",
+]
+
+MOJANG_OS_ARCHITECTURE_TRANSLATIONS = {
+    64: "x64",
+    32: "x86",
+    "x32": "x86",
+    "i386": "x86",
+    "aarch64": "arm64",
+    "x86_64": "x64",
+    "arm": "arm32",
+    "riscv64": "riscv64",
+}
+
+
+def translate_arch(arch: str | int):
+    if isinstance(arch, str):
+        arch = arch.lower()
+    if arch in MOJANG_OS_ARCHITECTURES:
+        return arch
+    elif arch in MOJANG_OS_ARCHITECTURE_TRANSLATIONS:
+        return MOJANG_OS_ARCHITECTURE_TRANSLATIONS[arch]
+    else:
+        return None
+
+
+MOJANG_OS_NAMES = [
+    "mac-os",
+    "linux",
+    "windows",
+]
+
+MOJANG_OS_TRANSLATIONS = {
+    "osx": "mac-os",
+    "mac": "mac-os",
+    "macos": "mac-os",
+}
+
+
+def translate_os(os: str):
+    os = os.lower()
+    if os in MOJANG_OS_NAMES:
+        return os
+    elif os in MOJANG_OS_TRANSLATIONS:
+        return MOJANG_OS_TRANSLATIONS[os]
+    else:
+        return None
+
+
+def mojang_os_to_java_os(mojang_os: MojangJavaOsName) -> JavaRuntimeOS:
+    match mojang_os:
+        case MojangJavaOsName.Linux:
+            return JavaRuntimeOS.LinuxX64
+        case MojangJavaOsName.Linuxi386:
+            return JavaRuntimeOS.LinuxX86
+        case MojangJavaOsName.MacOs:
+            return JavaRuntimeOS.MacOsX64
+        case MojangJavaOsName.MacOSArm64:
+            return JavaRuntimeOS.MacOsArm64
+        case MojangJavaOsName.WindowsArm64:
+            return JavaRuntimeOS.WindowsArm64
+        case MojangJavaOsName.WindowsX64:
+            return JavaRuntimeOS.WindowsX64
+        case MojangJavaOsName.WindowsX86:
+            return JavaRuntimeOS.WindowsX86
+        case _:
+            return JavaRuntimeOS.Unknown
+
+
+def mojang_component_to_major(mojang_component: MojangJavaComponent) -> int:
+    match mojang_component:
+        case MojangJavaComponent.JreLegacy:
+            return 8
+        case MojangJavaComponent.Alpha:
+            return 17
+        case MojangJavaComponent.Beta:
+            return 17
+        case MojangJavaComponent.Gamma:
+            return 17
+        case MojangJavaComponent.GammaSnapshot:
+            return 17
+        case MojangJavaComponent.Exe:
+            return 0
+        case MojangJavaComponent.Delta:
+            return 21
+        case MojangJavaComponent.Epsilon:
+            return 25
+        case _:
+            return 0
+
+
+def mojang_runtime_to_java_runtime(
+    mojang_runtime: MojangJavaRuntime,
+    mojang_component: MojangJavaComponent,
+    runtime_os: JavaRuntimeOS,
+) -> JavaRuntimeMeta:
+    major, _, trail = mojang_runtime.version.name.partition("u")
+    security, _, buildstr = trail.partition("-")
+
+    if buildstr == "":
+        buildstr = None
+
+    if major and security:
+        version_parts = [int(major), 0, int(security)]
+    else:
+        version_parts = [int(part) for part in mojang_runtime.version.name.split(".")]
+
+    while len(version_parts) < 3:
+        version_parts.append(0)
+
+    build = None
+    if len(version_parts) >= 4:
+        build = version_parts[3]
+
+    version = JavaVersionMeta(
+        major=version_parts[0],
+        minor=version_parts[1],
+        security=version_parts[2],
+        build=build,
+        buildstr=buildstr,
+        name=mojang_runtime.version.name,
+    )
+    return JavaRuntimeMeta(
+        name=mojang_component,
+        vendor="mojang",
+        url=mojang_runtime.manifest.url,
+        releaseTime=mojang_runtime.version.released,
+        checksum=JavaChecksumMeta(
+            type=JavaChecksumType.Sha1, hash=mojang_runtime.manifest.sha1
+        ),
+        downloadType=JavaRuntimeDownloadType.Manifest,
+        packageType=JavaPackageType.Jre,
+        version=version,
+        runtime_os=runtime_os,
+    )
+
+
+def adoptx_release_binary_to_java_runtime(
+    rls: AdoptxRelease,
+    binary: AdoptxBinary,
+    runtime_os: JavaRuntimeOS,
+) -> JavaRuntimeMeta:
+    assert binary.package is not None
+
+    checksum = None
+    if binary.package.checksum is not None:
+        checksum = JavaChecksumMeta(
+            type=JavaChecksumType.Sha256, hash=binary.package.checksum
+        )
+
+    pkg_type = JavaPackageType(str(binary.image_type))
+
+    version = JavaVersionMeta(
+        major=rls.version_data.major if rls.version_data.major is not None else 0,
+        minor=rls.version_data.minor if rls.version_data.minor is not None else 0,
+        security=(
+            rls.version_data.security if rls.version_data.security is not None else 0
+        ),
+        build=rls.version_data.build,
+    )
+
+    if rls.vendor == "eclipse":
+        rls_distribution = "temurin"
+    elif rls.vendor == "ibm":
+        rls_distribution = "semeru-open"
+
+    rls_name = f"{rls.vendor}_{rls_distribution}_{binary.image_type}{version}"
+    return JavaRuntimeMeta(
+        name=rls_name,
+        vendor=rls.vendor,
+        url=binary.package.link,
+        releaseTime=rls.timestamp,
+        checksum=checksum,
+        downloadType=JavaRuntimeDownloadType.Archive,
+        packageType=pkg_type,
+        version=version,
+        runtime_os=runtime_os,
+    )
+
+
+def azul_package_to_java_runtime(
+    pkg: ZuluPackageDetail, runtime_os: JavaRuntimeOS
+) -> JavaRuntimeMeta:
+    version_parts = copy.copy(pkg.java_version)
+
+    build = None
+    while len(version_parts) < 3:
+        version_parts.append(0)
+
+    if len(version_parts) >= 4:
+        build = version_parts[3]
+
+    version = JavaVersionMeta(
+        major=version_parts[0],
+        minor=version_parts[1],
+        security=version_parts[2],
+        build=build,
+    )
+
+    pkg_type = JavaPackageType(str(pkg.java_package_type))
+
+    rls_name = f"azul_{pkg.product}_{pkg.java_package_type}{version}"
+
+    checksum = None
+    if pkg.sha256_hash is not None:
+        checksum = JavaChecksumMeta(type=JavaChecksumType.Sha256, hash=pkg.sha256_hash)
+
+    return JavaRuntimeMeta(
+        name=rls_name,
+        vendor="azul",
+        url=pkg.download_url,
+        releaseTime=pkg.build_date,
+        checksum=checksum,
+        downloadType=JavaRuntimeDownloadType.Archive,
+        packageType=pkg_type,
+        version=version,
+        runtime_os=runtime_os,
+    )
+
+
+def writeJavas(javas: dict[int, list[JavaRuntimeMeta]], uid: str):
+    def oldest_timestamp(a: datetime.datetime | None, b: datetime.datetime):
+        if a is None or a > b:
+            return b
+        return a
+
+    ensure_component_dir(uid)
+
+    # small hack to sort the versions after major
+    javas = dict(sorted(javas.items(), key=lambda item: item[0]))
+    timestamps: dict[int, datetime.datetime | None] = {}
+    prevDate: datetime.datetime | None = None
+    for major, runtimes in javas.items():
+        releaseTime = reduce(
+            oldest_timestamp,
+            (runtime.release_time for runtime in runtimes),
+            None,
+        )
+        if prevDate is not None and releaseTime < prevDate:
+            releaseTime = prevDate + datetime.timedelta(seconds=1)
+        prevDate = releaseTime
+        timestamps[major] = releaseTime
+
+    for major, runtimes in javas.items():
+        version_file = os.path.join(LAUNCHER_DIR, uid, f"java{major}.json")
+        java_version = JavaRuntimeVersion(
+            name=f"Java {major}",
+            uid=uid,
+            version=f"java{major}",
+            releaseTime=timestamps.get(major),
+            runtimes=runtimes,
+        )
+        java_version.write(version_file)
+
+    package = MetaPackage(uid=uid, name="Java Runtimes", recommended=[])
+    package.write(os.path.join(LAUNCHER_DIR, uid, "package.json"))
+
+
+def main():
+    javas: dict[int, list[JavaRuntimeMeta]] = {}
+    extra_mojang_javas: dict[int, list[JavaRuntimeMeta]] = {}
+
+    def add_java_runtime(runtime: JavaRuntimeMeta, major: int):
+        if major not in javas:
+            javas[major] = list[JavaRuntimeMeta]()
+        print(f"Registering runtime: {runtime.name} for Java {major}")
+        javas[major].append(runtime)
+
+        # only add specific versions to the list
+        if (
+            (
+                runtime.runtime_os
+                in [JavaRuntimeOS.MacOsArm64, JavaRuntimeOS.WindowsArm64]
+                and major == 8
+            )
+            or (
+                runtime.runtime_os
+                in [
+                    JavaRuntimeOS.WindowsArm32,
+                    JavaRuntimeOS.LinuxArm32,
+                    JavaRuntimeOS.LinuxArm64,
+                ]
+                and major in [8, 17, 21, 25]
+            )
+            or (
+                runtime.runtime_os
+                in [JavaRuntimeOS.LinuxX86, JavaRuntimeOS.LinuxRiscv64]
+                and major in [17, 21, 25]
+            )
+        ):
+            if major not in extra_mojang_javas:
+                extra_mojang_javas[major] = list[JavaRuntimeMeta]()
+            extra_mojang_javas[major].append(runtime)
+
+    print("Processing Adoptium Releases")
+    adoptium_path = os.path.join(UPSTREAM_DIR, ADOPTIUM_DIR, "available_releases.json")
+    if os.path.exists(adoptium_path):
+        adoptium_available_releases = AdoptxAvailableReleases.parse_file(adoptium_path)
+        for major in adoptium_available_releases.available_releases:
+            adoptium_releases = AdoptxReleases.parse_file(
+                os.path.join(UPSTREAM_DIR, ADOPTIUM_VERSIONS_DIR, f"java{major}.json")
+            )
+            for _, rls in adoptium_releases:
+                for binary in rls.binaries:
+                    if (
+                        binary.package is None
+                        or binary.image_type is not AdoptxImageType.Jre
+                    ):
+                        continue
+                    binary_arch = translate_arch(str(binary.architecture))
+                    binary_os = translate_os(str(binary.os))
+                    if binary_arch is None or binary_os is None:
+                        print(f"Ignoring release for {binary.os} {binary.architecture}")
+                        continue
+
+                    java_os = JavaRuntimeOS(f"{binary_os}-{binary_arch}")
+                    runtime = adoptx_release_binary_to_java_runtime(
+                        rls, binary, java_os
+                    )
+                    add_java_runtime(runtime, major)
+    writeJavas(javas=javas, uid=JAVA_ADOPTIUM_COMPONENT)
+    javas = {}
+
+    print("Processing OpenJ9 Releases")
+    openj9_path = os.path.join(UPSTREAM_DIR, OPENJ9_DIR, "available_releases.json")
+    if os.path.exists(openj9_path):
+        openj9_available_releases = AdoptxAvailableReleases.parse_file(openj9_path)
+        for major in openj9_available_releases.available_releases:
+            path = os.path.join(UPSTREAM_DIR, OPENJ9_VERSIONS_DIR, f"java{major}.json")
+
+            if not os.path.exists(path):
+                continue
+
+            openj9_releases = AdoptxReleases.parse_file(path)
+            for _, rls in openj9_releases:
+                for binary in rls.binaries:
+                    if (
+                        binary.package is None
+                        or binary.image_type is not AdoptxImageType.Jre
+                    ):
+                        continue
+                    binary_arch = translate_arch(str(binary.architecture))
+                    binary_os = translate_os(str(binary.os))
+                    if binary_arch is None or binary_os is None:
+                        print(f"Ignoring release for {binary.os} {binary.architecture}")
+                        continue
+
+                    java_os = JavaRuntimeOS(f"{binary_os}-{binary_arch}")
+                    runtime = adoptx_release_binary_to_java_runtime(
+                        rls, binary, java_os
+                    )
+                    add_java_runtime(runtime, major)
+    writeJavas(javas=javas, uid=JAVA_OPENJ9_COMPONENT)
+    javas = {}
+
+    print("Processing Azul Packages")
+    azul_path = os.path.join(UPSTREAM_DIR, AZUL_DIR, "packages.json")
+    if os.path.exists(azul_path):
+        azul_packages = ZuluPackageList.parse_file(azul_path)
+        for _, pkg in azul_packages:
+            pkg_detail = ZuluPackageDetail.parse_file(
+                os.path.join(
+                    UPSTREAM_DIR, AZUL_VERSIONS_DIR, f"{pkg.package_uuid}.json"
+                )
+            )
+            major = pkg_detail.java_version[0]
+            if major < 8 or pkg_detail.java_package_type is not AzulJavaPackageType.Jre:
+                continue  # we will never need java versions less than 8
+
+            pkg_os = translate_os(str(pkg_detail.os))
+            if pkg_detail.arch == AzulArch.Arm:
+                pkg_arch = translate_arch(f"{pkg_detail.arch}{pkg_detail.hw_bitness}")
+            elif pkg_detail.arch == AzulArch.X86:
+                pkg_arch = translate_arch(int(pkg_detail.hw_bitness))
+            else:
+                pkg_arch = None
+            if pkg_arch is None or pkg_os is None:
+                print(
+                    f"Ignoring release for {pkg_detail.os} {pkg_detail.arch}_{pkg_detail.hw_bitness}"
+                )
+                continue
+
+            java_os = JavaRuntimeOS(f"{pkg_os}-{pkg_arch}")
+            runtime = azul_package_to_java_runtime(pkg_detail, java_os)
+            add_java_runtime(runtime, major)
+    writeJavas(javas=javas, uid=JAVA_AZUL_COMPONENT)
+    javas = {}
+
+    # constructs the missing mojang javas based on adoptium or azul (do not consider openj9 since it is for more niche cases)
+    def get_mojang_extra_java(
+        mojang_component: MojangJavaComponent, java_os: JavaRuntimeOS
+    ) -> JavaRuntimeMeta | None:
+        java_major = mojang_component_to_major(mojang_component)
+        if not java_major in extra_mojang_javas:
+            return None
+        posible_javas = list(
+            filter(lambda x: x.runtime_os == java_os, extra_mojang_javas[java_major])
+        )
+        if len(posible_javas) == 0:
+            return None
+        prefered_vendor = list(filter(lambda x: x.vendor != "azul", posible_javas))
+        if len(prefered_vendor) == 0:
+            prefered_vendor = posible_javas
+        prefered_vendor.sort(key=lambda x: x.version, reverse=True)
+        runtime = prefered_vendor[0]
+        runtime.name = mojang_component
+        return runtime
+
+    print("Processing Mojang Javas")
+    mojang_java_manifest = JavaIndex.parse_file(
+        os.path.join(UPSTREAM_DIR, JAVA_MANIFEST_FILE)
+    )
+    # print(mojang_java_manifest)
+    for mojang_os_name in mojang_java_manifest:
+        if mojang_os_name == MojangJavaOsName.Gamecore:
+            continue  # empty
+        java_os = mojang_os_to_java_os(mojang_os_name)
+        for comp in mojang_java_manifest[mojang_os_name]:
+            if comp == MojangJavaComponent.Exe:
+                continue  # doesn't appear to be used and not marked with a full verison so I don't trust it
+            mojang_runtimes = mojang_java_manifest[mojang_os_name][comp]
+            if len(mojang_runtimes) == 0:
+                if mojang_os_name in [
+                    MojangJavaOsName.WindowsArm64,
+                    MojangJavaOsName.MacOSArm64,
+                ]:
+                    if comp in [MojangJavaComponent.Alpha, MojangJavaComponent.Beta]:
+                        mojang_runtimes = mojang_java_manifest[mojang_os_name][
+                            MojangJavaComponent.Gamma
+                        ]
+                    elif (
+                        comp == MojangJavaComponent.JreLegacy
+                    ):  # arm version of win and mac is missing the legacy java
+                        runtime = get_mojang_extra_java(comp, java_os)
+                        if runtime != None:
+                            add_java_runtime(runtime, mojang_component_to_major(comp))
+                if (
+                    mojang_os_name == MojangJavaOsName.Linuxi386
+                    and comp != MojangJavaComponent.JreLegacy
+                ):  # the linux x86 is missing all but legacy
+                    runtime = get_mojang_extra_java(comp, java_os)
+                    if runtime != None:
+                        add_java_runtime(runtime, mojang_component_to_major(comp))
+            for mojang_runtime in mojang_runtimes:
+                if comp == MojangJavaComponent.JreLegacy:
+                    major = 8
+                else:
+                    major = int(mojang_runtime.version.name.partition(".")[0])
+                runtime = mojang_runtime_to_java_runtime(mojang_runtime, comp, java_os)
+                add_java_runtime(runtime, major)
+    # mojang doesn't provide any versions for the following systems so borrow info from adoptium/azul (do not consider openj9 since it is for more niche cases)
+    for java_os in [
+        JavaRuntimeOS.WindowsArm32,
+        JavaRuntimeOS.LinuxArm32,
+        JavaRuntimeOS.LinuxArm64,
+        JavaRuntimeOS.LinuxRiscv64,
+    ]:
+        for comp in [
+            MojangJavaComponent.JreLegacy,
+            MojangJavaComponent.Alpha,
+            MojangJavaComponent.Beta,
+            MojangJavaComponent.Gamma,
+            MojangJavaComponent.GammaSnapshot,
+            MojangJavaComponent.Delta,
+            MojangJavaComponent.Epsilon,
+        ]:
+            runtime = get_mojang_extra_java(comp, java_os)
+            if runtime != None:
+                add_java_runtime(runtime, mojang_component_to_major(comp))
+
+    writeJavas(javas=javas, uid=JAVA_MINECRAFT_COMPONENT)
+    javas = {}
+
+
+if __name__ == "__main__":
+    main()
diff --git a/meta/meta/run/generate_liteloader.py b/meta/meta/run/generate_liteloader.py
new file mode 100755
index 0000000000..2fe95fcc42
--- /dev/null
+++ b/meta/meta/run/generate_liteloader.py
@@ -0,0 +1,118 @@
+import os
+from datetime import datetime
+from typing import List, Tuple, Dict, Optional
+
+from meta.common import ensure_component_dir, launcher_path, upstream_path
+from meta.common.liteloader import LITELOADER_COMPONENT, VERSIONS_FILE
+from meta.common.mojang import MINECRAFT_COMPONENT
+from meta.model import MetaVersion, GradleSpecifier, Library, MetaPackage, Dependency
+from meta.model.liteloader import LiteloaderIndex, LiteloaderArtefact
+
+LAUNCHER_DIR = launcher_path()
+UPSTREAM_DIR = upstream_path()
+
+ensure_component_dir(LITELOADER_COMPONENT)
+
+
+def process_artefacts(
+    mc_version: str, artefacts: Dict[str, LiteloaderArtefact], is_snapshot: bool
+) -> Tuple[List[MetaVersion], Optional[MetaVersion]]:
+    versions: List[MetaVersion] = []
+    lookup: Dict[str, MetaVersion] = {}
+    latest_version = None
+    latest = None
+    for x, artefact in artefacts.items():
+        if x == "latest":
+            latest_version = artefact.version
+            continue
+        v = MetaVersion(
+            name="LiteLoader",
+            uid=LITELOADER_COMPONENT,
+            version=artefact.version,
+            requires=[Dependency(uid=MINECRAFT_COMPONENT, equals=mc_version)],
+            release_time=datetime.utcfromtimestamp(int(artefact.timestamp)),
+            additional_tweakers=[artefact.tweakClass],
+            main_class="net.minecraft.launchwrapper.Launch",
+            order=10,
+            libraries=artefact.libraries,
+            type="release",
+        )
+
+        if is_snapshot:
+            v.type = "snapshot"
+
+        # hack to make broken liteloader versions work
+        for lib in v.libraries:
+            if lib.name == GradleSpecifier("org.ow2.asm", "asm-all", "5.0.3"):
+                lib.url = "https://repo.maven.apache.org/maven2/"
+            if lib.name == GradleSpecifier("org.ow2.asm", "asm-all", "5.2"):
+                lib.url = "http://repo.liteloader.com/"
+
+        liteloader_lib = Library(
+            name=GradleSpecifier("com.mumfrey", "liteloader", v.version),
+            url="http://dl.liteloader.com/versions/",
+        )
+        if is_snapshot:
+            liteloader_lib.mmcHint = "always-stale"
+        v.libraries.append(liteloader_lib)
+
+        versions.append(v)
+        lookup[v.version] = v
+
+    if latest_version:
+        latest = lookup[latest_version]
+    return versions, latest
+
+
+def process_versions(index: LiteloaderIndex) -> Tuple[List[MetaVersion], List[str]]:
+    all_versions: List[MetaVersion] = []
+    recommended: List[str] = []
+    for mcVersion, versionObject in index.versions.items():
+        # ignore this for now. It should be a jar mod or something.
+        if mcVersion == "1.5.2":
+            continue
+
+        latest_release = None
+        if versionObject.artefacts:
+            versions, latest_release = process_artefacts(
+                mcVersion, versionObject.artefacts.liteloader, False
+            )
+            all_versions.extend(versions)
+        if versionObject.snapshots:
+            versions, latest_snapshot = process_artefacts(
+                mcVersion, versionObject.snapshots.liteloader, True
+            )
+            all_versions.extend(versions)
+
+        if latest_release:
+            recommended.append(latest_release.version)
+
+    recommended.sort()
+
+    all_versions.sort(key=lambda x: x.release_time, reverse=True)
+    return all_versions, recommended
+
+
+def main():
+    index = LiteloaderIndex.parse_file(os.path.join(UPSTREAM_DIR, VERSIONS_FILE))
+
+    all_versions, recommended = process_versions(index)
+
+    for version in all_versions:
+        version.write(
+            os.path.join(LAUNCHER_DIR, LITELOADER_COMPONENT, f"{version.version}.json")
+        )
+
+    package = MetaPackage(
+        uid=LITELOADER_COMPONENT,
+        name="LiteLoader",
+        description=index.meta.description,
+        project_url=index.meta.url,
+        authors=[index.meta.authors],
+        recommended=recommended,
+    )
+    package.write(os.path.join(LAUNCHER_DIR, LITELOADER_COMPONENT, "package.json"))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/meta/meta/run/generate_mojang.py b/meta/meta/run/generate_mojang.py
new file mode 100755
index 0000000000..9d2063263a
--- /dev/null
+++ b/meta/meta/run/generate_mojang.py
@@ -0,0 +1,589 @@
+import copy
+import hashlib
+import re
+import os
+from collections import defaultdict, namedtuple
+from operator import attrgetter
+from pprint import pprint
+from packaging import version as pversion
+from typing import Optional, List
+
+from meta.common import ensure_component_dir, launcher_path, upstream_path
+from meta.common.mojang import (
+    STATIC_LEGACY_SERVICES_FILE,
+    VERSION_MANIFEST_FILE,
+    MINECRAFT_COMPONENT,
+    LWJGL3_COMPONENT,
+    LWJGL_COMPONENT,
+    STATIC_OVERRIDES_FILE,
+    VERSIONS_DIR,
+    LIBRARY_PATCHES_FILE,
+)
+from meta.model import (
+    MetaVersion,
+    Library,
+    GradleSpecifier,
+    MojangLibraryDownloads,
+    MojangArtifact,
+    Dependency,
+    MetaPackage,
+    MojangRules,
+)
+from meta.model.mojang import (
+    LegacyServices,
+    MojangIndexWrap,
+    MojangIndex,
+    MojangVersion,
+    LegacyOverrideIndex,
+    LibraryPatches,
+    SUPPORTED_FEATURES,
+)
+
+APPLY_SPLIT_NATIVES_WORKAROUND = True
+
+LAUNCHER_DIR = launcher_path()
+UPSTREAM_DIR = upstream_path()
+
+ensure_component_dir(MINECRAFT_COMPONENT)
+ensure_component_dir(LWJGL_COMPONENT)
+ensure_component_dir(LWJGL3_COMPONENT)
+
+
+def map_log4j_artifact(version):
+    x = pversion.parse(version)
+    if x <= pversion.parse("2.0"):
+        return "2.0-beta9-fixed", "https://files.prismlauncher.org/maven/%s"
+    if x <= pversion.parse("2.17.1"):
+        return (
+            "2.17.1",
+            "https://repo1.maven.org/maven2/%s",
+        )  # This is the only version that's patched (as of 2022/02/19)
+    return None, None
+
+
+LOG4J_HASHES = {
+    "2.0-beta9-fixed": {
+        "log4j-api": {
+            "sha1": "b61eaf2e64d8b0277e188262a8b771bbfa1502b3",
+            "size": 107347,
+        },
+        "log4j-core": {
+            "sha1": "677991ea2d7426f76309a73739cecf609679492c",
+            "size": 677588,
+        },
+    },
+    "2.17.1": {
+        "log4j-api": {
+            "sha1": "d771af8e336e372fb5399c99edabe0919aeaf5b2",
+            "size": 301872,
+        },
+        "log4j-core": {
+            "sha1": "779f60f3844dadc3ef597976fcb1e5127b1f343d",
+            "size": 1790452,
+        },
+        "log4j-slf4j18-impl": {
+            "sha1": "ca499d751f4ddd8afb016ef698c30be0da1d09f7",
+            "size": 21268,
+        },
+    },
+}
+
+# We want versions that contain natives for all platforms. If there are multiple, pick the latest one
+# LWJGL versions we want
+PASS_VARIANTS = [
+    "1fd0e4d1f0f7c97e8765a69d38225e1f27ee14ef",  # 3.4.1 (2026-02-17 12:42:24+00:00)
+    "2b00f31688148fc95dbc8c8ef37308942cf0dce0",  # 3.3.6 (2025-10-21 11:38:51+00:00)
+    "73974b3af2afeb5b272ffbadcd7963014387c84f",  # 3.3.3 (2024-05-22 16:25:41+00:00)
+    "765b4ab443051d286bdbb1c19cd7dc86b0792dce",  # 3.3.2 (2024-01-17 13:19:20+00:00)
+    "54c4fb1d6a96ac3007c947bf310c8bcf94a862be",  # 3.3.1 (2023-04-20 11:55:19+00:00) split natives, with WoA natives
+    "ea4973ebc9eadf059f30f0958c89f330898bff51",  # 3.2.2 (2019-07-04 14:41:05+00:00) will be patched, missing tinyfd
+    "235fc413bc4c76b269c207f7bca6464f1e1f1d80",  # 3.2.1 (2019-02-13 16:12:08+00:00)
+    "deb1a436d806413207350735a00e04b54d113916",  # 3.1.6 (2018-10-18 14:46:12+00:00)
+    "3e47f0f742fb759401754769fa59c508fd8fda75",  # 3.1.2 (2018-06-21 12:57:11+00:00)
+    "a3f254df5a63a0a1635755733022029e8cfae1b3",  # 2.9.4-nightly-20150209 (2016-12-20 14:05:34+00:00)
+    "879be09c0bd0d4bafc2ea4ea3d2ab8607a0d976c",  # 2.9.3 (2015-01-30 11:58:24+00:00)
+    "8d4951d00253dfaa36a0faf1c8be541431861c30",  # 2.9.1 (2014-05-22 14:44:33+00:00)
+    "cf58c9f92fed06cb041a7244c6b4b667e6d544cc",  # 2.9.1-nightly-20131120 (2013-12-06 13:55:34+00:00)
+    "27dcadcba29a1a7127880ca1a77efa9ece866f24",  # 2.9.0 (2013-09-06 12:31:58+00:00)
+]
+
+# LWJGL versions we def. don't want!
+BAD_VARIANTS = [
+    "6f32ef730d05562ede7db0b845b72ea16dd239d5",  # 3.3.3 (2024-05-29 12:04:43+00:00) missing os rule for freetype natives-macos-patch
+    "8a9b08f11271eb4de3b50e5d069949500b2c7bc1",  # 3.3.3 (2024-04-03 11:49:39+00:00) seems to have a broken libfreetype for macOS x86_64
+    "79bde9e46e9ad9accebda11e8293ed08d80dbdc3",  # 3.3.2 (2023-08-30 11:24:35+00:00) does not have lwjgl-freetype
+    "8836c419f90f69a278b97d945a34af165c24ff60",  # 3.3.1 (2022-05-18 13:51:54+00:00) split natives, with workaround, replaced by 23w26a
+    "3c624b94c06dbc4abae08fe6156d74abe4a2cca5",  # 3.3.1 (2022-05-04 14:41:35+00:00) we already have a nice 3.3.1
+    "e1106ca765798218323b7a6d7528050260ea9d88",  # 3.3.1 (2022-05-04 14:41:35+00:00) doesn't use split natives
+    "90b3d9ca01058286c033b6b7ae7f6dc370a04015",  # 3.2.2 (2022-03-31 14:53:25+00:00) only linux, windows
+    "d986df9598fa2bcf4a5baab5edf044548e66d011",  # 3.2.2 (2021-12-10 03:36:38+00:00) only linux, windows
+    "4b73fccb9e5264c2068bdbc26f9651429abbf21a",  # 3.2.2 (2021-08-25 14:41:57+00:00) only linux, windows
+    "090cec3577ecfe438b890b2a9410ea07aa725e16",  # 3.2.2 (2021-04-07 14:04:09+00:00) only linux, windows
+    "ab463e9ebc6a36abf22f2aa27b219dd372ff5069",  # 3.2.2 (2019-08-13 07:33:42+00:00) only linux, windows
+    "51d8ff5a7efc949b4ad2088930e151d6b88ba616",  # 3.2.2 (2019-07-19 09:25:47+00:00) only linux, windows
+    "854649a5bd1455b89117593ae82ff90c8132cacf",  # 3.2.1 (2019-04-18 11:05:19+00:00) only osx, windows
+    "89fcb489261b05f622e8052fe0b588b0cfe49c24",  # 3.1.6 (2019-04-18 11:05:19+00:00) only linux
+    "f04052162b50fa1433f67e1a90bc79466c4ab776",  # 2.9.0 (2013-10-21 16:34:47+00:00) only linux, windows
+    "6442fc475f501fbd0fc4244fd1c38c02d9ebaf7e",  # 2.9.0 (2011-03-30 22:00:00+00:00) fine but newer variant available
+]
+
+
+def add_or_get_bucket(buckets, rules: Optional[MojangRules]) -> MetaVersion:
+    rule_hash = None
+    if rules:
+        rule_hash = hash(rules.json())
+
+    if rule_hash in buckets:
+        bucket = buckets[rule_hash]
+    else:
+        bucket = MetaVersion(name="LWJGL", version="undetermined", uid=LWJGL_COMPONENT)
+        bucket.type = "release"
+        buckets[rule_hash] = bucket
+    return bucket
+
+
+def hash_lwjgl_version(lwjgl: MetaVersion):
+    lwjgl_copy = copy.deepcopy(lwjgl)
+    lwjgl_copy.release_time = None
+    return hashlib.sha1(lwjgl_copy.json().encode("utf-8", "strict")).hexdigest()
+
+
+def sort_libs_by_name(library):
+    return library.name
+
+
+LWJGLEntry = namedtuple("LWJGLEntry", ("version", "sha1"))
+
+lwjglVersionVariants = defaultdict(list)
+
+
+def add_lwjgl_version(variants, lwjgl):
+    lwjgl_copy = copy.deepcopy(lwjgl)
+    libraries = list(lwjgl_copy.libraries)
+    libraries.sort(key=sort_libs_by_name)
+    lwjgl_copy.libraries = libraries
+
+    version = lwjgl_copy.version
+    current_hash = hash_lwjgl_version(lwjgl_copy)
+    found = False
+    for variant in variants[version]:
+        existing_hash = variant.sha1
+        if current_hash == existing_hash:
+            found = True
+            break
+    if not found:
+        print("!!! New variant for LWJGL version %s" % version)
+        variants[version].append(LWJGLEntry(version=lwjgl_copy, sha1=current_hash))
+
+
+def remove_paths_from_lib(lib):
+    if lib.downloads.artifact:
+        lib.downloads.artifact.path = None
+    if lib.downloads.classifiers:
+        for key, value in lib.downloads.classifiers.items():
+            value.path = None
+
+
+def adapt_new_style_arguments(arguments):
+    foo = []
+    # we ignore the jvm arguments entirely.
+    # grab the strings, log the complex stuff
+    for arg in arguments.game:
+        if isinstance(arg, str):
+            if arg == "--clientId":
+                continue
+            if arg == "${clientid}":
+                continue
+            if arg == "--xuid":
+                continue
+            if arg == "${auth_xuid}":
+                continue
+            foo.append(arg)
+        else:
+            print("!!! Unrecognized structure in Minecraft game arguments:")
+            pprint(arg)
+    return " ".join(foo)
+
+
+def adapt_new_style_arguments_to_traits(arguments):
+    foo = []
+    # we ignore the jvm arguments entirely.
+    # grab the object, log the errors
+    for arg in arguments.game:
+        if isinstance(arg, dict):
+            for rule in arg["rules"]:
+                for k, v in rule["features"].items():
+                    if rule["action"] == "allow" and v and k in SUPPORTED_FEATURES:
+                        foo.append(f"feature:{k}")
+    return foo
+
+
+def is_macos_only(rules: Optional[MojangRules]):
+    allows_osx = False
+    allows_all = False
+    # print("Considering", specifier, "rules", rules)
+    if rules:
+        for rule in rules:
+            if rule.action == "allow" and rule.os and rule.os.name == "osx":
+                allows_osx = True
+            if rule.action == "allow" and not rule.os:
+                allows_all = True
+        if allows_osx and not allows_all:
+            return True
+    return False
+
+
+def patch_library(lib: Library, patches: LibraryPatches) -> List[Library]:
+    to_patch = [lib]
+
+    new_libraries = []
+    while to_patch:
+        target = to_patch.pop(0)
+
+        for patch in patches:
+            if patch.applies(target):
+                if patch.override:
+                    target.merge(patch.override)
+
+                if patch.additionalLibraries:
+                    additional_copy = copy.deepcopy(patch.additionalLibraries)
+                    new_libraries += list(dict.fromkeys(additional_copy))
+                    if patch.patchAdditionalLibraries:
+                        to_patch += additional_copy
+
+    return new_libraries
+
+
+def process_single_variant(lwjgl_variant: MetaVersion, patches: LibraryPatches):
+    lwjgl_version = lwjgl_variant.version
+    v = copy.deepcopy(lwjgl_variant)
+
+    new_libraries = []
+    for lib in v.libraries:
+        new_libraries += patch_library(lib, patches)
+    v.libraries += list(dict.fromkeys(new_libraries))
+
+    if lwjgl_version[0] == "2":
+        filename = os.path.join(LAUNCHER_DIR, LWJGL_COMPONENT, f"{lwjgl_version}.json")
+
+        v.name = "LWJGL 2"
+        v.uid = LWJGL_COMPONENT
+        v.conflicts = [Dependency(uid=LWJGL3_COMPONENT)]
+    elif lwjgl_version[0] == "3":
+        filename = os.path.join(LAUNCHER_DIR, LWJGL3_COMPONENT, f"{lwjgl_version}.json")
+
+        v.name = "LWJGL 3"
+        v.uid = LWJGL3_COMPONENT
+        v.conflicts = [Dependency(uid=LWJGL_COMPONENT)]
+        # remove jutils and jinput from LWJGL 3
+        # this is a dependency that Mojang kept in, but doesn't belong there anymore
+        filtered_libraries = list(
+            filter(lambda l: l.name.artifact not in ["jutils", "jinput"], v.libraries)
+        )
+        v.libraries = filtered_libraries
+    else:
+        raise Exception("LWJGL version not recognized: %s" % v.version)
+
+    v.volatile = True
+    v.order = -1
+    good = True
+    for lib in v.libraries:
+        # skip libraries without natives or that we patched
+        if not lib.natives or lib in new_libraries:
+            continue
+        checked_dict = {"linux", "windows", "osx"}
+        if not checked_dict.issubset(lib.natives.keys()):
+            print("Missing system classifier!", v.version, lib.name, lib.natives.keys())
+            good = False
+            break
+        if lib.downloads:
+            for entry in checked_dict:
+                baked_entry = lib.natives[entry]
+                if baked_entry not in lib.downloads.classifiers:
+                    print(
+                        "Missing download for classifier!",
+                        v.version,
+                        lib.name,
+                        baked_entry,
+                        lib.downloads.classifiers.keys(),
+                    )
+                    good = False
+                    break
+    if good:
+        v.write(filename)
+    else:
+        print("Skipped LWJGL", v.version)
+
+
+def lib_is_split_native(lib: Library) -> bool:
+    if lib.name.classifier and lib.name.classifier.startswith("natives-"):
+        return True
+    return False
+
+
+def version_has_split_natives(v: MojangVersion) -> bool:
+    for lib in v.libraries:
+        if lib_is_split_native(lib):
+            return True
+    return False
+
+
+def main():
+    # get the local version list
+    override_index = LegacyOverrideIndex.parse_file(STATIC_OVERRIDES_FILE)
+    legacy_services = LegacyServices.parse_file(STATIC_LEGACY_SERVICES_FILE)
+    library_patches = LibraryPatches.parse_file(LIBRARY_PATCHES_FILE)
+
+    found_any_lwjgl3 = False
+
+    for filename in os.listdir(os.path.join(UPSTREAM_DIR, VERSIONS_DIR)):
+        input_file = os.path.join(UPSTREAM_DIR, VERSIONS_DIR, filename)
+        if not input_file.endswith(".json"):
+            # skip non JSON files
+            continue
+        print("Processing", filename)
+        mojang_version = MojangVersion.parse_file(input_file)
+        v = mojang_version.to_meta_version(
+            "Minecraft", MINECRAFT_COMPONENT, mojang_version.id
+        )
+
+        libs_minecraft = []
+        new_libs_minecraft = []
+        is_lwjgl_3 = False
+        has_split_natives = version_has_split_natives(v)
+        buckets = {}
+
+        for lib in v.libraries:
+            specifier = lib.name
+
+            # generic fixes
+            remove_paths_from_lib(lib)
+
+            if APPLY_SPLIT_NATIVES_WORKAROUND and lib_is_split_native(lib):
+                # merge classifier into artifact name to workaround bug in launcher
+                specifier.artifact += f"-{specifier.classifier}"
+                specifier.classifier = None
+
+            if specifier.is_lwjgl():
+                if has_split_natives:  # implies lwjgl3
+                    bucket = add_or_get_bucket(buckets, None)
+                    is_lwjgl_3 = True
+                    found_any_lwjgl3 = True
+                    bucket.version = specifier.version
+                    if not bucket.libraries:
+                        bucket.libraries = []
+                    bucket.libraries.append(lib)
+                    bucket.release_time = v.release_time
+                else:
+                    rules = None
+                    if lib.rules:
+                        rules = lib.rules
+                        lib.rules = None
+                    if is_macos_only(rules):
+                        print(
+                            "Candidate library ",
+                            specifier,
+                            " is only for macOS and is therefore ignored.",
+                        )
+                        continue
+                    bucket = add_or_get_bucket(buckets, rules)
+                    if (
+                        specifier.group == "org.lwjgl.lwjgl"
+                        and specifier.artifact == "lwjgl"
+                    ):
+                        bucket.version = specifier.version
+                    if specifier.group == "org.lwjgl" and specifier.artifact == "lwjgl":
+                        is_lwjgl_3 = True
+                        found_any_lwjgl3 = True
+                        bucket.version = specifier.version
+                    if not bucket.libraries:
+                        bucket.libraries = []
+                    bucket.libraries.append(lib)
+                    bucket.release_time = v.release_time
+            # FIXME: workaround for insane log4j nonsense from December 2021. Probably needs adjustment.
+            elif lib.name.is_log4j():
+                version_override, maven_override = map_log4j_artifact(lib.name.version)
+
+                if version_override and maven_override:
+                    if version_override not in LOG4J_HASHES:
+                        raise Exception(
+                            "ERROR: unhandled log4j version (overriden) %s!"
+                            % version_override
+                        )
+
+                    if lib.name.artifact not in LOG4J_HASHES[version_override]:
+                        raise Exception(
+                            "ERROR: unhandled log4j artifact %s!" % lib.name.artifact
+                        )
+
+                    replacement_name = GradleSpecifier(
+                        "org.apache.logging.log4j", lib.name.artifact, version_override
+                    )
+                    artifact = MojangArtifact(
+                        url=maven_override % (replacement_name.path()),
+                        sha1=LOG4J_HASHES[version_override][lib.name.artifact]["sha1"],
+                        size=LOG4J_HASHES[version_override][lib.name.artifact]["size"],
+                    )
+
+                    libs_minecraft.append(
+                        Library(
+                            name=replacement_name,
+                            downloads=MojangLibraryDownloads(artifact=artifact),
+                        )
+                    )
+                else:
+                    libs_minecraft.append(lib)
+            else:
+                new_libs_minecraft += patch_library(lib, library_patches)
+                libs_minecraft.append(lib)
+        if len(buckets) == 1:
+            for key in buckets:
+                lwjgl = buckets[key]
+                lwjgl.libraries = sorted(lwjgl.libraries, key=attrgetter("name"))
+                add_lwjgl_version(lwjglVersionVariants, lwjgl)
+                print("Found only candidate LWJGL", lwjgl.version, key)
+        else:
+            # multiple buckets for LWJGL. [None] is common to all, other keys are for different sets of rules
+            for key in buckets:
+                if key is None:
+                    continue
+                lwjgl = buckets[key]
+                if None in buckets:
+                    lwjgl.libraries = sorted(
+                        lwjgl.libraries + buckets[None].libraries,
+                        key=attrgetter("name"),
+                    )
+                else:
+                    lwjgl.libraries = sorted(lwjgl.libraries, key=attrgetter("name"))
+                add_lwjgl_version(lwjglVersionVariants, lwjgl)
+                print("Found candidate LWJGL", lwjgl.version, key)
+            # remove the common bucket...
+            if None in buckets:
+                del buckets[None]
+        v.libraries = libs_minecraft + list(dict.fromkeys(new_libs_minecraft))
+
+        if is_lwjgl_3:
+            lwjgl_dependency = Dependency(uid=LWJGL3_COMPONENT)
+        else:
+            lwjgl_dependency = Dependency(uid=LWJGL_COMPONENT)
+        if len(buckets) == 1:
+            suggested_version = next(iter(buckets.values())).version
+            if is_lwjgl_3:
+                lwjgl_dependency.suggests = suggested_version
+            else:
+                lwjgl_dependency.suggests = "2.9.4-nightly-20150209"
+        else:
+            bad_versions = {"3.1.6", "3.2.1"}
+            our_versions = set()
+
+            for lwjgl in iter(buckets.values()):
+                our_versions = our_versions.union({lwjgl.version})
+
+            if our_versions == bad_versions:
+                print("Found broken 3.1.6/3.2.1 combo, forcing LWJGL to 3.2.1")
+                suggested_version = "3.2.1"
+                lwjgl_dependency.suggests = suggested_version
+            else:
+                raise Exception(
+                    "ERROR: cannot determine single suggested LWJGL version in %s"
+                    % mojang_version.id
+                )
+
+        # if it uses LWJGL 3, add the trait that enables starting on first thread on macOS
+        if is_lwjgl_3:
+            if not v.additional_traits:
+                v.additional_traits = []
+            v.additional_traits.append("FirstThreadOnMacOS")
+        v.requires = [lwjgl_dependency]
+        v.order = -2
+        # process 1.13 arguments into previous version
+        if not mojang_version.minecraft_arguments and mojang_version.arguments:
+            v.minecraft_arguments = adapt_new_style_arguments(mojang_version.arguments)
+            if not v.additional_traits:
+                v.additional_traits = []
+            v.additional_traits.extend(
+                adapt_new_style_arguments_to_traits(mojang_version.arguments)
+            )
+        out_filename = os.path.join(
+            LAUNCHER_DIR, MINECRAFT_COMPONENT, f"{v.version}.json"
+        )
+        if v.version in override_index.versions:
+            override = override_index.versions[v.version]
+            override.apply_onto_meta_version(v)
+        if v.version in legacy_services:
+            if v.additional_traits == None:
+                v.additional_traits = []
+            v.additional_traits.append("legacyServices")
+
+        # 13w16a-13w23a require legacyLaunch and those + 13w23b require texturepacks
+        if re.match(r"13w[1,2]\d[a-c]", v.version) and 16 <= int(v.version[3:-1]) <= 23:
+            if v.additional_traits == None:
+                v.additional_traits = []
+            if v.version != "13w23b":
+                v.additional_traits.append("legacyLaunch")
+            v.additional_traits.append("texturepacks")
+
+        v.write(out_filename)
+
+    for lwjglVersionVariant in lwjglVersionVariants:
+        decided_variant = None
+        passed_variants = 0
+        unknown_variants = 0
+        print(
+            "%d variant(s) for LWJGL %s:"
+            % (len(lwjglVersionVariants[lwjglVersionVariant]), lwjglVersionVariant)
+        )
+
+        for variant in lwjglVersionVariants[lwjglVersionVariant]:
+            if variant.sha1 in BAD_VARIANTS:
+                print("Variant %s ignored because it's marked as bad." % variant.sha1)
+                continue
+            if variant.sha1 in PASS_VARIANTS:
+                print("Variant %s accepted." % variant.sha1)
+                decided_variant = variant
+                passed_variants += 1
+                continue
+            # print natives classifiers to decide which variant to use
+            n = [
+                x.natives.keys()
+                for x in variant.version.libraries
+                if x.natives is not None
+            ]
+            print(n)
+
+            print(
+                f'    "{variant.sha1}",  # {lwjglVersionVariant} ({variant.version.release_time})'
+            )
+            unknown_variants += 1
+        print("")
+
+        if decided_variant and passed_variants == 1 and unknown_variants == 0:
+            process_single_variant(decided_variant.version, library_patches)
+        else:
+            raise Exception(
+                "No variant decided for version %s out of %d possible ones and %d unknown ones."
+                % (lwjglVersionVariant, passed_variants, unknown_variants)
+            )
+
+    lwjgl_package = MetaPackage(uid=LWJGL_COMPONENT, name="LWJGL 2")
+    lwjgl_package.write(os.path.join(LAUNCHER_DIR, LWJGL_COMPONENT, "package.json"))
+
+    if found_any_lwjgl3:
+        lwjgl_package = MetaPackage(uid=LWJGL3_COMPONENT, name="LWJGL 3")
+        lwjgl_package.write(
+            os.path.join(LAUNCHER_DIR, LWJGL3_COMPONENT, "package.json")
+        )
+
+    mojang_index = MojangIndexWrap(
+        MojangIndex.parse_file(os.path.join(UPSTREAM_DIR, VERSION_MANIFEST_FILE))
+    )
+
+    minecraft_package = MetaPackage(uid=MINECRAFT_COMPONENT, name="Minecraft")
+    minecraft_package.recommended = [mojang_index.latest.release]
+    minecraft_package.write(
+        os.path.join(LAUNCHER_DIR, MINECRAFT_COMPONENT, "package.json")
+    )
+
+
+if __name__ == "__main__":
+    main()
diff --git a/meta/meta/run/generate_neoforge.py b/meta/meta/run/generate_neoforge.py
new file mode 100644
index 0000000000..de32256869
--- /dev/null
+++ b/meta/meta/run/generate_neoforge.py
@@ -0,0 +1,170 @@
+from copy import deepcopy
+import os
+import re
+from operator import attrgetter
+from typing import Collection
+
+from meta.common import ensure_component_dir, launcher_path, upstream_path, eprint
+from meta.common.neoforge import (
+    NEOFORGE_COMPONENT,
+    INSTALLER_MANIFEST_DIR,
+    VERSION_MANIFEST_DIR,
+    DERIVED_INDEX_FILE,
+    INSTALLER_INFO_DIR,
+)
+from meta.common.forge import FORGEWRAPPER_LIBRARY
+from meta.common.mojang import MINECRAFT_COMPONENT
+from meta.model import (
+    MetaVersion,
+    Dependency,
+    Library,
+    GradleSpecifier,
+    MojangLibraryDownloads,
+    MojangArtifact,
+    MetaPackage,
+)
+from meta.model.neoforge import (
+    NeoForgeVersion,
+    NeoForgeInstallerProfileV2,
+    InstallerInfo,
+    DerivedNeoForgeIndex,
+)
+from meta.model.mojang import MojangVersion
+
+LAUNCHER_DIR = launcher_path()
+UPSTREAM_DIR = upstream_path()
+
+ensure_component_dir(NEOFORGE_COMPONENT)
+
+
+def version_from_build_system_installer(
+    installer: MojangVersion,
+    profile: NeoForgeInstallerProfileV2,
+    version: NeoForgeVersion,
+) -> MetaVersion:
+    v = MetaVersion(name="NeoForge", version=version.rawVersion, uid=NEOFORGE_COMPONENT)
+    v.main_class = "io.github.zekerzhayard.forgewrapper.installer.Main"
+
+    # FIXME: Add the size and hash here
+    v.maven_files = []
+
+    # load the locally cached installer file info and use it to add the installer entry in the json
+    info = InstallerInfo.parse_file(
+        os.path.join(UPSTREAM_DIR, INSTALLER_INFO_DIR, f"{version.long_version}.json")
+    )
+    installer_lib = Library(
+        name=GradleSpecifier(
+            "net.neoforged", version.artifact, version.long_version, "installer"
+        )
+    )
+    installer_lib.downloads = MojangLibraryDownloads()
+    installer_lib.downloads.artifact = MojangArtifact(
+        url="https://maven.neoforged.net/releases/%s" % (installer_lib.name.path()),
+        sha1=info.sha1hash,
+        size=info.size,
+    )
+    v.maven_files.append(installer_lib)
+
+    for forge_lib in profile.libraries:
+        if forge_lib.name.is_log4j():
+            continue
+
+        v.maven_files.append(forge_lib)
+
+    v.libraries = []
+
+    v.libraries.append(FORGEWRAPPER_LIBRARY)
+
+    for forge_lib in installer.libraries:
+        if forge_lib.name.is_log4j():
+            continue
+
+        v.libraries.append(forge_lib)
+
+    v.release_time = installer.release_time
+    v.order = 5
+    mc_args = (
+        "--username ${auth_player_name} --version ${version_name} --gameDir ${game_directory} "
+        "--assetsDir ${assets_root} --assetIndex ${assets_index_name} --uuid ${auth_uuid} "
+        "--accessToken ${auth_access_token} --userType ${user_type} --versionType ${version_type}"
+    )
+    for arg in installer.arguments.game:
+        mc_args += f" {arg}"
+    v.minecraft_arguments = mc_args
+    return v
+
+
+def main():
+    # load the locally cached version list
+    remote_versions = DerivedNeoForgeIndex.parse_file(
+        os.path.join(UPSTREAM_DIR, DERIVED_INDEX_FILE)
+    )
+    recommended_versions = []
+
+    for key, entry in remote_versions.versions.items():
+        version = NeoForgeVersion(entry)
+
+        if version.url() is None:
+            eprint("Skipping %s with no valid files" % key)
+            continue
+        eprint("Processing NeoForge %s" % version.rawVersion)
+        version_elements = version.rawVersion.split(".")
+        if len(version_elements) < 1:
+            eprint("Skipping version %s with not enough version elements" % key)
+            continue
+
+        major_version_str = version_elements[0]
+        if not major_version_str.isnumeric():
+            eprint(
+                "Skipping version %s with non-numeric major version %s"
+                % (key, major_version_str)
+            )
+            continue
+
+        if entry.recommended:
+            recommended_versions.append(version.rawVersion)
+
+        # Path for new-style build system based installers
+        installer_version_filepath = os.path.join(
+            UPSTREAM_DIR, VERSION_MANIFEST_DIR, f"{version.long_version}.json"
+        )
+        profile_filepath = os.path.join(
+            UPSTREAM_DIR, INSTALLER_MANIFEST_DIR, f"{version.long_version}.json"
+        )
+
+        eprint(installer_version_filepath)
+        assert os.path.isfile(
+            installer_version_filepath
+        ), f"version {installer_version_filepath} does not have installer version manifest"
+        installer = MojangVersion.parse_file(installer_version_filepath)
+        profile = NeoForgeInstallerProfileV2.parse_file(profile_filepath)
+        v = version_from_build_system_installer(installer, profile, version)
+
+        # we can get the minecraft version from the profile json info, so let's just do that instead of hacky regex
+        v.requires = [Dependency(uid=MINECRAFT_COMPONENT, equals=profile.minecraft)]
+        # If we do not have the corresponding Minecraft version, we ignore it
+        if not os.path.isfile(
+            os.path.join(LAUNCHER_DIR, MINECRAFT_COMPONENT, f"{profile.minecraft}.json")
+        ):
+            eprint(
+                "Skipping %s with no corresponding Minecraft version %s"
+                % (key, profile.minecraft)
+            )
+            continue
+        v.write(os.path.join(LAUNCHER_DIR, NEOFORGE_COMPONENT, f"{v.version}.json"))
+
+        recommended_versions.sort()
+
+        print("Recommended versions:", recommended_versions)
+
+        package = MetaPackage(
+            uid=NEOFORGE_COMPONENT,
+            name="NeoForge",
+            project_url="https://neoforged.net",
+        )
+        package.recommended = recommended_versions
+        package.write(os.path.join(LAUNCHER_DIR, NEOFORGE_COMPONENT, "package.json"))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/meta/meta/run/generate_quilt.py b/meta/meta/run/generate_quilt.py
new file mode 100755
index 0000000000..01964d5864
--- /dev/null
+++ b/meta/meta/run/generate_quilt.py
@@ -0,0 +1,176 @@
+import json
+import os
+import sys
+
+from meta.common import (
+    ensure_component_dir,
+    launcher_path,
+    upstream_path,
+    transform_maven_key,
+)
+from meta.common.quilt import (
+    JARS_DIR,
+    INSTALLER_INFO_DIR,
+    META_DIR,
+    INTERMEDIARY_COMPONENT,
+    LOADER_COMPONENT,
+    USE_QUILT_MAPPINGS,
+    DISABLE_BEACON_ARG,
+    DISABLE_BEACON_VERSIONS,
+)
+from meta.model import MetaVersion, Dependency, Library, MetaPackage, GradleSpecifier
+from meta.model.fabric import FabricJarInfo, FabricInstallerDataV1, FabricMainClasses
+
+LAUNCHER_DIR = launcher_path()
+UPSTREAM_DIR = upstream_path()
+
+ensure_component_dir(LOADER_COMPONENT)
+ensure_component_dir(INTERMEDIARY_COMPONENT)
+
+
+def eprint(*args, **kwargs):
+    print(*args, file=sys.stderr, **kwargs)
+
+
+def load_jar_info(artifact_key) -> FabricJarInfo:
+    return FabricJarInfo.parse_file(
+        os.path.join(UPSTREAM_DIR, JARS_DIR, f"{artifact_key}.json")
+    )
+
+
+def load_installer_info(version) -> FabricInstallerDataV1:
+    return FabricInstallerDataV1.parse_file(
+        os.path.join(UPSTREAM_DIR, INSTALLER_INFO_DIR, f"{version}.json")
+    )
+
+
+def process_loader_version(entry) -> (MetaVersion, bool):
+    should_recommend = (
+        "-" not in entry["version"]
+    )  # Don't recommend pre releases as per SemVer
+
+    jar_info = load_jar_info(transform_maven_key(entry["maven"]))
+    installer_info = load_installer_info(entry["version"])
+
+    v = MetaVersion(name="Quilt Loader", uid=LOADER_COMPONENT, version=entry["version"])
+    v.release_time = jar_info.release_time
+    v.requires = [Dependency(uid=INTERMEDIARY_COMPONENT)]
+    v.order = 10
+    v.type = "release"
+    if isinstance(installer_info.main_class, FabricMainClasses):
+        v.main_class = installer_info.main_class.client
+    else:
+        v.main_class = installer_info.main_class
+    v.libraries = []
+    v.libraries.extend(installer_info.libraries.common)
+    v.libraries.extend(installer_info.libraries.client)
+    loader_lib = Library(
+        name=GradleSpecifier.from_string(entry["maven"]),
+        url="https://maven.quiltmc.org/repository/release",
+    )
+    v.libraries.append(loader_lib)
+
+    if entry["version"] in DISABLE_BEACON_VERSIONS:
+        if not v.additional_jvm_args:
+            v.additional_jvm_args = []
+        v.additional_jvm_args.append(DISABLE_BEACON_ARG)
+
+    return v, should_recommend
+
+
+def process_intermediary_version(entry) -> MetaVersion:
+    jar_info = load_jar_info(transform_maven_key(entry["maven"]))
+
+    v = MetaVersion(
+        name="Quilt Intermediary Mappings",
+        uid=INTERMEDIARY_COMPONENT,
+        version=entry["version"],
+    )
+    v.release_time = jar_info.release_time
+    v.requires = [Dependency(uid="net.minecraft", equals=entry["version"])]
+    v.order = 11
+    v.type = "release"
+    v.libraries = []
+    v.volatile = True
+    intermediary_lib = Library(
+        name=GradleSpecifier.from_string(entry["maven"]),
+        url="https://maven.quiltmc.org/repository/release",
+    )
+    v.libraries.append(intermediary_lib)
+    return v
+
+
+def main():
+    recommended_loader_versions = []
+    recommended_intermediary_versions = []
+
+    with open(
+        os.path.join(UPSTREAM_DIR, META_DIR, "loader.json"), "r", encoding="utf-8"
+    ) as f:
+        loader_version_index = json.load(f)
+        for entry in loader_version_index:
+            version = entry["version"]
+            print(f"Processing loader {version}")
+            try:
+                v, should_recommend = process_loader_version(entry)
+
+                if (
+                    not recommended_loader_versions and should_recommend
+                ):  # newest stable loader is recommended
+                    recommended_loader_versions.append(version)
+
+                v.write(
+                    os.path.join(LAUNCHER_DIR, LOADER_COMPONENT, f"{v.version}.json")
+                )
+            except Exception as e:
+                eprint("Failed to download %s" % version)
+                eprint("Error is %s" % e)
+                continue
+
+    if USE_QUILT_MAPPINGS:
+        with open(
+            os.path.join(UPSTREAM_DIR, META_DIR, "hashed.json"), "r", encoding="utf-8"
+        ) as f:
+            intermediary_version_index = json.load(f)
+            for entry in intermediary_version_index:
+                version = entry["version"]
+                print(f"Processing intermediary {version}")
+
+                try:
+                    v = process_intermediary_version(entry)
+
+                    recommended_intermediary_versions.append(
+                        version
+                    )  # all intermediaries are recommended
+
+                    v.write(
+                        os.path.join(
+                            LAUNCHER_DIR, INTERMEDIARY_COMPONENT, f"{v.version}.json"
+                        )
+                    )
+                except Exception as e:
+                    eprint("Failed to download %s" % version)
+                    eprint("Error is %s" % e)
+                    continue
+    package = MetaPackage(uid=LOADER_COMPONENT, name="Quilt Loader")
+    package.recommended = recommended_loader_versions
+    package.description = "The Quilt project is an open, community-driven modding toolchain designed primarily for Minecraft."
+    package.project_url = "https://quiltmc.org/"
+    package.authors = ["Quilt Project"]
+    package.write(os.path.join(LAUNCHER_DIR, LOADER_COMPONENT, "package.json"))
+
+    if USE_QUILT_MAPPINGS:
+        package = MetaPackage(
+            uid=INTERMEDIARY_COMPONENT, name="Quilt Intermediary Mappings"
+        )
+        package.recommended = recommended_intermediary_versions
+        package.description = "Intermediary mappings allow using Quilt Loader with mods for Minecraft in a more compatible manner."
+        package.project_url = "https://quiltmc.org/"
+        package.authors = ["Quilt Project"]
+        package.write(
+            os.path.join(LAUNCHER_DIR, INTERMEDIARY_COMPONENT, "package.json")
+        )
+
+
+if __name__ == "__main__":
+    main()
diff --git a/meta/meta/run/index.py b/meta/meta/run/index.py
new file mode 100755
index 0000000000..22abea8457
--- /dev/null
+++ b/meta/meta/run/index.py
@@ -0,0 +1,71 @@
+import hashlib
+import os
+from operator import attrgetter
+
+from meta.common import launcher_path, file_hash
+
+
+from meta.model import MetaVersion, MetaPackage
+from meta.model.index import (
+    MetaPackageIndex,
+    MetaVersionIndex,
+    MetaVersionIndexEntry,
+    MetaPackageIndexEntry,
+)
+
+LAUNCHER_DIR = launcher_path()
+
+
+# ignore these files when indexing versions
+ignore = {"index.json", "package.json", ".git", ".github"}
+
+# initialize output structures - package list level
+packages = MetaPackageIndex()
+
+# walk through all the package folders
+for package in sorted(os.listdir(LAUNCHER_DIR)):
+    if package in ignore:
+        continue
+
+    sharedData = MetaPackage.parse_file(
+        os.path.join(LAUNCHER_DIR, package, "package.json")
+    )
+    recommendedVersions = set()
+    if sharedData.recommended:
+        recommendedVersions = set(sharedData.recommended)
+
+    # initialize output structures - version list level
+    versionList = MetaVersionIndex(uid=package, name=sharedData.name)
+
+    # walk through all the versions of the package
+    for filename in os.listdir(LAUNCHER_DIR + "/%s" % package):
+        if filename in ignore:
+            continue
+        # parse and hash the version file
+        filepath = LAUNCHER_DIR + "/%s/%s" % (package, filename)
+        filehash = file_hash(filepath, hashlib.sha256)
+        versionFile = MetaVersion.parse_file(filepath)
+        is_recommended = versionFile.version in recommendedVersions
+
+        versionEntry = MetaVersionIndexEntry.from_meta_version(
+            versionFile, is_recommended, filehash
+        )
+
+        versionList.versions.append(versionEntry)
+
+    # sort the versions in descending order by time of release
+    versionList.versions = sorted(
+        versionList.versions, key=attrgetter("release_time"), reverse=True
+    )
+
+    # write the version index for the package
+    outFilePath = LAUNCHER_DIR + "/%s/index.json" % package
+    versionList.write(outFilePath)
+
+    # insert entry into the package index
+    packageEntry = MetaPackageIndexEntry(
+        uid=package, name=sharedData.name, sha256=file_hash(outFilePath, hashlib.sha256)
+    )
+    packages.packages.append(packageEntry)
+
+packages.write(os.path.join(LAUNCHER_DIR, "index.json"))
diff --git a/meta/meta/run/update_fabric.py b/meta/meta/run/update_fabric.py
new file mode 100755
index 0000000000..d19540b5e4
--- /dev/null
+++ b/meta/meta/run/update_fabric.py
@@ -0,0 +1,133 @@
+from collections import deque
+from multiprocessing import Pool
+import json
+import os
+import zipfile
+from datetime import datetime
+
+import requests
+
+from meta.common import (
+    upstream_path,
+    ensure_upstream_dir,
+    transform_maven_key,
+    default_session,
+)
+from meta.common.fabric import (
+    JARS_DIR,
+    INSTALLER_INFO_DIR,
+    META_DIR,
+    DATETIME_FORMAT_HTTP,
+)
+from meta.model.fabric import FabricJarInfo
+
+UPSTREAM_DIR = upstream_path()
+
+ensure_upstream_dir(JARS_DIR)
+ensure_upstream_dir(INSTALLER_INFO_DIR)
+ensure_upstream_dir(META_DIR)
+
+sess = default_session()
+
+
+def get_maven_url(maven_key, server, ext):
+    parts = maven_key.split(":", 3)
+    maven_ver_url = (
+        server + parts[0].replace(".", "/") + "/" + parts[1] + "/" + parts[2] + "/"
+    )
+    maven_url = maven_ver_url + parts[1] + "-" + parts[2] + ext
+    return maven_url
+
+
+def get_json_file(path, url):
+    with open(path, "w", encoding="utf-8") as f:
+        r = sess.get(url)
+        r.raise_for_status()
+        version_json = r.json()
+        json.dump(version_json, f, sort_keys=True, indent=4)
+        return version_json
+
+
+def head_file(url):
+    r = sess.head(url)
+    r.raise_for_status()
+    return r.headers
+
+
+def get_binary_file(path, url):
+    r = sess.get(url)
+    r.raise_for_status()
+    with open(path, "wb") as f:
+        for chunk in r.iter_content(chunk_size=128):
+            f.write(chunk)
+
+
+def compute_jar_file(path, url):
+    # These two approaches should result in the same metadata, except for the timestamp which might be a few minutes
+    # off for the fallback method
+    try:
+        # Let's not download a Jar file if we don't need to.
+        headers = head_file(url)
+        tstamp = datetime.strptime(headers["Last-Modified"], DATETIME_FORMAT_HTTP)
+    except requests.HTTPError:
+        # Just in case something changes in the future
+        print(f"Falling back to downloading jar for {url}")
+
+        jar_path = path + ".jar"
+        get_binary_file(jar_path, url)
+        tstamp = datetime.fromtimestamp(0)
+        with zipfile.ZipFile(jar_path) as jar:
+            allinfo = jar.infolist()
+            for info in allinfo:
+                tstamp_new = datetime(*info.date_time)
+                if tstamp_new > tstamp:
+                    tstamp = tstamp_new
+
+    data = FabricJarInfo(release_time=tstamp)
+    data.write(path + ".json")
+
+
+def compute_jar_file_concurrent(it):
+    print(f"Processing {it['version']} ")
+    jar_maven_url = get_maven_url(it["maven"], "https://maven.fabricmc.net/", ".jar")
+    compute_jar_file(
+        os.path.join(UPSTREAM_DIR, JARS_DIR, transform_maven_key(it["maven"])),
+        jar_maven_url,
+    )
+    print(f"Processing {it['version']} Done")
+
+
+def get_json_file_concurrent(it):
+    print(f"Downloading JAR info for loader {it['version']} ")
+    maven_url = get_maven_url(it["maven"], "https://maven.fabricmc.net/", ".json")
+    get_json_file(
+        os.path.join(UPSTREAM_DIR, INSTALLER_INFO_DIR, f"{it['version']}.json"),
+        maven_url,
+    )
+    print(f"Downloading JAR info for loader {it['version']} Done")
+
+
+def main():
+    # get the version list for each component we are interested in
+    for component in ["intermediary", "loader"]:
+        index = get_json_file(
+            os.path.join(UPSTREAM_DIR, META_DIR, f"{component}.json"),
+            "https://meta.fabricmc.net/v2/versions/" + component,
+        )
+        with Pool(None) as pool:
+            deque(pool.imap_unordered(compute_jar_file_concurrent, index, 32), 0)
+
+    # for each loader, download installer JSON file from maven
+    with open(
+        os.path.join(UPSTREAM_DIR, META_DIR, "loader.json"), "r", encoding="utf-8"
+    ) as loaderVersionIndexFile:
+        loader_version_index = json.load(loaderVersionIndexFile)
+        with Pool(None) as pool:
+            deque(
+                pool.imap_unordered(get_json_file_concurrent, loader_version_index, 32),
+                0,
+            )
+
+
+if __name__ == "__main__":
+    main()
diff --git a/meta/meta/run/update_forge.py b/meta/meta/run/update_forge.py
new file mode 100755
index 0000000000..c74865b31f
--- /dev/null
+++ b/meta/meta/run/update_forge.py
@@ -0,0 +1,419 @@
+"""
+Get the source files necessary for generating Forge versions
+"""
+
+import concurrent.futures
+import copy
+import hashlib
+import json
+import os
+import re
+import zipfile
+from contextlib import suppress
+from datetime import datetime
+from pathlib import Path
+from pprint import pprint
+
+from pydantic import ValidationError
+
+from meta.common import (
+    upstream_path,
+    ensure_upstream_dir,
+    default_session,
+    remove_files,
+    eprint,
+    file_hash,
+    get_file_sha1_from_file,
+)
+from meta.common.forge import (
+    JARS_DIR,
+    INSTALLER_INFO_DIR,
+    INSTALLER_MANIFEST_DIR,
+    VERSION_MANIFEST_DIR,
+    FILE_MANIFEST_DIR,
+    BAD_VERSIONS,
+    LEGACYINFO_FILE,
+)
+from meta.model.forge import (
+    ForgeFile,
+    ForgeEntry,
+    ForgeMCVersionInfo,
+    ForgeLegacyInfoList,
+    DerivedForgeIndex,
+    ForgeVersion,
+    ForgeInstallerProfile,
+    ForgeInstallerProfileV2,
+    InstallerInfo,
+    ForgeLegacyInfo,
+)
+from meta.common.http import download_binary_file
+from meta.model.mojang import MojangVersion
+
+UPSTREAM_DIR = upstream_path()
+
+ensure_upstream_dir(JARS_DIR)
+ensure_upstream_dir(INSTALLER_INFO_DIR)
+ensure_upstream_dir(INSTALLER_MANIFEST_DIR)
+ensure_upstream_dir(VERSION_MANIFEST_DIR)
+ensure_upstream_dir(FILE_MANIFEST_DIR)
+
+LEGACYINFO_PATH = os.path.join(UPSTREAM_DIR, LEGACYINFO_FILE)
+
+sess = default_session()
+
+
+def get_single_forge_files_manifest(longversion):
+    print(f"Getting Forge manifest for {longversion}")
+    path_thing = UPSTREAM_DIR + "/forge/files_manifests/%s.json" % longversion
+    files_manifest_file = Path(path_thing)
+    from_file = False
+    if files_manifest_file.is_file():
+        with open(path_thing, "r") as f:
+            files_json = json.load(f)
+            from_file = True
+    else:
+        file_url = (
+            "https://files.minecraftforge.net/net/minecraftforge/forge/%s/meta.json"
+            % longversion
+        )
+        r = sess.get(file_url)
+        r.raise_for_status()
+        files_json = r.json()
+
+    ret_dict = dict()
+
+    for classifier, extensionObj in files_json.get("classifiers").items():
+        assert type(classifier) == str
+        assert type(extensionObj) == dict
+
+        # assert len(extensionObj.items()) == 1
+        index = 0
+        count = 0
+        while index < len(extensionObj.items()):
+            mutable_copy = copy.deepcopy(extensionObj)
+            extension, hashtype = mutable_copy.popitem()
+            if not type(classifier) == str:
+                pprint(classifier)
+                pprint(extensionObj)
+            if not type(hashtype) == str:
+                pprint(classifier)
+                pprint(extensionObj)
+                print(
+                    "%s: Skipping missing hash for extension %s:"
+                    % (longversion, extension)
+                )
+                index += 1
+                continue
+            assert type(classifier) == str
+            processed_hash = re.sub(r"\W", "", hashtype)
+            if not len(processed_hash) == 32:
+                print(
+                    "%s: Skipping invalid hash for extension %s:"
+                    % (longversion, extension)
+                )
+                pprint(extensionObj)
+                index += 1
+                continue
+
+            file_obj = ForgeFile(
+                classifier=classifier, hash=processed_hash, extension=extension
+            )
+            if count == 0:
+                ret_dict[classifier] = file_obj
+                index += 1
+                count += 1
+            else:
+                print(
+                    "%s: Multiple objects detected for classifier %s:"
+                    % (longversion, classifier)
+                )
+                pprint(extensionObj)
+                assert False
+
+    if not from_file:
+        with open(path_thing, "w", encoding="utf-8") as f:
+            json.dump(files_json, f, sort_keys=True, indent=4)
+
+    return ret_dict
+
+
+def process_forge_version(version, jar_path):
+    installer_info_path = (
+        UPSTREAM_DIR + "/forge/installer_info/%s.json" % version.long_version
+    )
+    profile_path = (
+        UPSTREAM_DIR + "/forge/installer_manifests/%s.json" % version.long_version
+    )
+    version_file_path = (
+        UPSTREAM_DIR + "/forge/version_manifests/%s.json" % version.long_version
+    )
+
+    new_sha1 = None
+    sha1_file = jar_path + ".sha1"
+    fileSha1 = get_file_sha1_from_file(jar_path, sha1_file)
+    try:
+        rfile = sess.get(version.url() + ".sha1")
+        rfile.raise_for_status()
+        new_sha1 = rfile.text.strip()
+        if fileSha1 != new_sha1:
+            remove_files([jar_path, profile_path, installer_info_path, sha1_file])
+    except Exception as e:
+        eprint("Failed to check sha1 %s" % version.url())
+        eprint("Error is %s" % e)
+
+    installer_refresh_required = not os.path.isfile(profile_path) or not os.path.isfile(
+        installer_info_path
+    )
+
+    if installer_refresh_required:
+        # grab the installer if it's not there
+        if not os.path.isfile(jar_path):
+            eprint("Downloading %s" % version.url())
+            download_binary_file(sess, jar_path, version.url())
+            if new_sha1 is None:
+                try:
+                    rfile = sess.get(version.url() + ".sha1")
+                    rfile.raise_for_status()
+                    new_sha1 = rfile.text.strip()
+                except Exception as e:
+                    eprint("Failed to download new sha1 %s" % version.url())
+                    eprint("Error is %s" % e)
+            if new_sha1 is not None:  # this is in case the fetch failed
+                with open(sha1_file, "w") as file:
+                    file.write(new_sha1)
+
+    eprint("Processing %s" % version.url())
+    # harvestables from the installer
+    if not os.path.isfile(profile_path):
+        print(jar_path)
+        with zipfile.ZipFile(jar_path) as jar:
+            with suppress(KeyError):
+                with jar.open("version.json") as profile_zip_entry:
+                    version_data = profile_zip_entry.read()
+
+                    # Process: does it parse?
+                    MojangVersion.parse_raw(version_data)
+
+                    with open(version_file_path, "wb") as versionJsonFile:
+                        versionJsonFile.write(version_data)
+                        versionJsonFile.close()
+
+            with jar.open("install_profile.json") as profile_zip_entry:
+                install_profile_data = profile_zip_entry.read()
+
+                # Process: does it parse?
+                is_parsable = False
+                exception = None
+                try:
+                    ForgeInstallerProfile.parse_raw(install_profile_data)
+                    is_parsable = True
+                except ValidationError as err:
+                    exception = err
+                try:
+                    ForgeInstallerProfileV2.parse_raw(install_profile_data)
+                    is_parsable = True
+                except ValidationError as err:
+                    exception = err
+
+                if not is_parsable:
+                    if version.is_supported():
+                        raise exception
+                    else:
+                        eprint(
+                            "Version %s is not supported and won't be generated later."
+                            % version.long_version
+                        )
+
+                with open(profile_path, "wb") as profileFile:
+                    profileFile.write(install_profile_data)
+                    profileFile.close()
+
+    # installer info v1
+    if not os.path.isfile(installer_info_path):
+        installer_info = InstallerInfo()
+        installer_info.sha1hash = file_hash(jar_path, hashlib.sha1)
+        installer_info.sha256hash = file_hash(jar_path, hashlib.sha256)
+        installer_info.size = os.path.getsize(jar_path)
+        installer_info.write(installer_info_path)
+
+
+def main():
+    # get the remote version list fragments
+    r = sess.get(
+        "https://files.minecraftforge.net/net/minecraftforge/forge/maven-metadata.json"
+    )
+    r.raise_for_status()
+    main_json = r.json()
+    assert type(main_json) == dict
+
+    r = sess.get(
+        "https://files.minecraftforge.net/net/minecraftforge/forge/promotions_slim.json"
+    )
+    r.raise_for_status()
+    promotions_json = r.json()
+    assert type(promotions_json) == dict
+
+    promoted_key_expression = re.compile(
+        "(?P<mc>[^-]+)-(?P<promotion>(latest)|(recommended))(-(?P<branch>[a-zA-Z0-9\\.]+))?"
+    )
+
+    recommended_set = set()
+
+    new_index = DerivedForgeIndex()
+
+    # FIXME: does not fully validate that the file has not changed format
+    # NOTE: For some insane reason, the format of the versions here is special. It having a branch at the end means it
+    #           affects that particular branch.
+    #       We don't care about Forge having branches.
+    #       Therefore we only use the short version part for later identification and filter out the branch-specific
+    #           promotions (among other errors).
+    print("Processing promotions:")
+    for promoKey, shortversion in promotions_json.get("promos").items():
+        match = promoted_key_expression.match(promoKey)
+        if not match:
+            print("Skipping promotion %s, the key did not parse:" % promoKey)
+            pprint(promoKey)
+            assert match
+        if not match.group("mc"):
+            print(
+                "Skipping promotion %s, because it has no Minecraft version." % promoKey
+            )
+            continue
+        if match.group("branch"):
+            print("Skipping promotion %s, because it on a branch only." % promoKey)
+            continue
+        elif match.group("promotion") == "recommended":
+            recommended_set.add(shortversion)
+            print("%s added to recommended set" % shortversion)
+        elif match.group("promotion") == "latest":
+            pass
+        else:
+            assert False
+
+    version_expression = re.compile(
+        "^(?P<mc>[0-9a-zA-Z_\\.]+)-(?P<ver>[0-9\\.]+\\.(?P<build>[0-9]+))(-(?P<branch>[a-zA-Z0-9\\.]+))?$"
+    )
+
+    print("")
+    print("Processing versions:")
+    for mc_version, value in main_json.items():
+        assert type(mc_version) == str
+        assert type(value) == list
+        for long_version in value:
+            assert type(long_version) == str
+            match = version_expression.match(long_version)
+            if not match:
+                pprint(long_version)
+                assert match
+            assert match.group("mc") == mc_version
+
+            files = get_single_forge_files_manifest(long_version)
+
+            build = int(match.group("build"))
+            version = match.group("ver")
+            branch = match.group("branch")
+
+            is_recommended = version in recommended_set
+
+            entry = ForgeEntry(
+                long_version=long_version,
+                mc_version=mc_version,
+                version=version,
+                build=build,
+                branch=branch,
+                # NOTE: we add this later after the fact. The forge promotions file lies about these.
+                latest=False,
+                recommended=is_recommended,
+                files=files,
+            )
+            new_index.versions[long_version] = entry
+            if not new_index.by_mc_version:
+                new_index.by_mc_version = dict()
+            if mc_version not in new_index.by_mc_version:
+                new_index.by_mc_version.setdefault(mc_version, ForgeMCVersionInfo())
+            new_index.by_mc_version[mc_version].versions.append(long_version)
+            # NOTE: we add this later after the fact. The forge promotions file lies about these.
+            # if entry.latest:
+            # new_index.by_mc_version[mc_version].latest = long_version
+            if entry.recommended:
+                new_index.by_mc_version[mc_version].recommended = long_version
+
+    print("")
+    print("Post processing promotions and adding missing 'latest':")
+    for mc_version, info in new_index.by_mc_version.items():
+        latest_version = info.versions[-1]
+        info.latest = latest_version
+        new_index.versions[latest_version].latest = True
+        print("Added %s as latest for %s" % (latest_version, mc_version))
+
+    print("")
+    print("Dumping index files...")
+
+    with open(UPSTREAM_DIR + "/forge/maven-metadata.json", "w", encoding="utf-8") as f:
+        json.dump(main_json, f, sort_keys=True, indent=4)
+
+    with open(UPSTREAM_DIR + "/forge/promotions_slim.json", "w", encoding="utf-8") as f:
+        json.dump(promotions_json, f, sort_keys=True, indent=4)
+
+    new_index.write(UPSTREAM_DIR + "/forge/derived_index.json")
+
+    legacy_info_list = ForgeLegacyInfoList()
+
+    print("Grabbing installers and dumping installer profiles...")
+    # get the installer jars - if needed - and get the installer profiles out of them
+    with concurrent.futures.ThreadPoolExecutor() as executor:
+        futures = []
+        for key, entry in new_index.versions.items():
+            eprint("Updating Forge %s" % key)
+            if entry.mc_version is None:
+                eprint("Skipping %d with invalid MC version" % entry.build)
+                continue
+
+            version = ForgeVersion(entry)
+            if version.url() is None:
+                eprint("Skipping %d with no valid files" % version.build)
+                continue
+            if version.long_version in BAD_VERSIONS:
+                eprint(f"Skipping bad version {version.long_version}")
+                continue
+
+            jar_path = os.path.join(UPSTREAM_DIR, JARS_DIR, version.filename())
+
+            if version.uses_installer():
+                futures.append(
+                    executor.submit(process_forge_version, version, jar_path)
+                )
+            else:
+                # ignore the two versions without install manifests and jar mod class files
+                # TODO: fix those versions?
+                if version.mc_version_sane == "1.6.1":
+                    continue
+
+                # only gather legacy info if it's missing
+                if not os.path.isfile(LEGACYINFO_PATH):
+                    # grab the jar/zip if it's not there
+                    if not os.path.isfile(jar_path):
+                        download_binary_file(sess, jar_path, version.url())
+                    # find the latest timestamp in the zip file
+                    tstamp = datetime.fromtimestamp(0)
+                    with zipfile.ZipFile(jar_path) as jar:
+                        for info in jar.infolist():
+                            tstamp_new = datetime(*info.date_time)
+                            if tstamp_new > tstamp:
+                                tstamp = tstamp_new
+                    legacy_info = ForgeLegacyInfo()
+                    legacy_info.release_time = tstamp
+                    legacy_info.sha1 = file_hash(jar_path, hashlib.sha1)
+                    legacy_info.sha256 = file_hash(jar_path, hashlib.sha256)
+                    legacy_info.size = os.path.getsize(jar_path)
+                    legacy_info_list.number[key] = legacy_info
+        for f in futures:
+            f.result()
+
+    # only write legacy info if it's missing
+    if not os.path.isfile(LEGACYINFO_PATH):
+        legacy_info_list.write(LEGACYINFO_PATH)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/meta/meta/run/update_java.py b/meta/meta/run/update_java.py
new file mode 100644
index 0000000000..80ca7b4a70
--- /dev/null
+++ b/meta/meta/run/update_java.py
@@ -0,0 +1,222 @@
+import os
+
+from meta.common import upstream_path, ensure_upstream_dir, default_session
+from meta.common.java import (
+    BASE_DIR,
+    ADOPTIUM_DIR,
+    OPENJ9_DIR,
+    AZUL_DIR,
+    ADOPTIUM_VERSIONS_DIR,
+    OPENJ9_VERSIONS_DIR,
+    AZUL_VERSIONS_DIR,
+)
+from meta.model.java import (
+    ADOPTIUM_API_BASE,
+    OPENJ9_API_BASE,
+    ADOPTX_API_AVAILABLE_RELEASES,
+    adoptxAPIFeatureReleasesUrl,
+    adoptiumAPIFeatureReleasesUrl,
+    openj9APIFeatureReleasesUrl,
+    AdoptxJvmImpl,
+    AdoptxVendor,
+    AdoptxImageType,
+    AdoptxAPIFeatureReleasesQuery,
+    AdoptxAvailableReleases,
+    AdoptxRelease,
+    AdoptxReleases,
+    azulApiPackagesUrl,
+    AzulApiPackagesQuery,
+    ZuluPackage,
+    ZuluPackageList,
+    AzulArchiveType,
+    AzulReleaseStatus,
+    AzulAvailabilityType,
+    AzulJavaPackageType,
+    azulApiPackageDetailUrl,
+    ZuluPackageDetail,
+    ZuluPackagesDetail,
+)
+
+UPSTREAM_DIR = upstream_path()
+
+ensure_upstream_dir(BASE_DIR)
+ensure_upstream_dir(ADOPTIUM_DIR)
+ensure_upstream_dir(OPENJ9_DIR)
+ensure_upstream_dir(AZUL_DIR)
+ensure_upstream_dir(ADOPTIUM_VERSIONS_DIR)
+ensure_upstream_dir(OPENJ9_VERSIONS_DIR)
+ensure_upstream_dir(AZUL_VERSIONS_DIR)
+
+
+sess = default_session()
+
+
+def main():
+    print("Getting Adoptium Release Manifests ")
+    r = sess.get(ADOPTX_API_AVAILABLE_RELEASES.format(base_url=ADOPTIUM_API_BASE))
+    r.raise_for_status()
+
+    available = AdoptxAvailableReleases(**r.json())
+
+    available_releases_file = os.path.join(
+        UPSTREAM_DIR, ADOPTIUM_DIR, "available_releases.json"
+    )
+    available.write(available_releases_file)
+
+    for feature in available.available_releases:
+        print("Getting Manifests for Adoptium feature release:", feature)
+
+        page_size = 10
+
+        releases_for_feature: list[AdoptxRelease] = []
+        page = 0
+        while True:
+            query = AdoptxAPIFeatureReleasesQuery(
+                image_type=AdoptxImageType.Jre,
+                page_size=page_size,
+                page=page,
+                jvm_impl=AdoptxJvmImpl.Hotspot,
+                vendor=AdoptxVendor.Eclipse,
+            )
+            api_call = adoptiumAPIFeatureReleasesUrl(feature, query=query)
+            print("Fetching JRE Page:", page, api_call)
+            r_rls = sess.get(api_call)
+            if r_rls.status_code == 404:
+                break
+            else:
+                r_rls.raise_for_status()
+
+            releases = list(AdoptxRelease(**rls) for rls in r_rls.json())
+            releases_for_feature.extend(releases)
+
+            if len(r_rls.json()) < page_size:
+                break
+            page += 1
+
+        print("Total Adoptium releases for feature:", len(releases_for_feature))
+        releases = AdoptxReleases(__root__=releases_for_feature)
+        feature_file = os.path.join(
+            UPSTREAM_DIR, ADOPTIUM_VERSIONS_DIR, f"java{feature}.json"
+        )
+        releases.write(feature_file)
+
+    print("Getting OpenJ9 Release Manifests ")
+    r = sess.get(ADOPTX_API_AVAILABLE_RELEASES.format(base_url=OPENJ9_API_BASE))
+    r.raise_for_status()
+
+    available = AdoptxAvailableReleases(**r.json())
+
+    available_releases_file = os.path.join(
+        UPSTREAM_DIR, OPENJ9_DIR, "available_releases.json"
+    )
+    available.write(available_releases_file)
+
+    for feature in available.available_releases:
+        print("Getting Manifests for OpenJ9 feature release:", feature)
+
+        page_size = 10
+
+        releases_for_feature: list[AdoptxRelease] = []
+        page = 0
+        while True:
+            query = AdoptxAPIFeatureReleasesQuery(
+                image_type=AdoptxImageType.Jre,
+                page_size=page_size,
+                page=page,
+                jvm_impl=AdoptxJvmImpl.OpenJ9,
+                vendor=AdoptxVendor.Ibm,
+            )
+            api_call = openj9APIFeatureReleasesUrl(feature, query=query)
+            print("Fetching JRE Page:", page, api_call)
+            r_rls = sess.get(api_call)
+            if r_rls.status_code == 404:
+                break
+            else:
+                r_rls.raise_for_status()
+
+            releases = list(AdoptxRelease(**rls) for rls in r_rls.json())
+            releases_for_feature.extend(releases)
+
+            if len(r_rls.json()) < page_size:
+                break
+            page += 1
+
+        print("Total OpenJ9 releases for feature:", len(releases_for_feature))
+        releases = AdoptxReleases(__root__=releases_for_feature)
+        if len(releases_for_feature) == 0:
+            continue
+        feature_file = os.path.join(
+            UPSTREAM_DIR, OPENJ9_VERSIONS_DIR, f"java{feature}.json"
+        )
+        releases.write(feature_file)
+
+    print("Getting Azul Release Manifests")
+    zulu_packages: list[ZuluPackage] = []
+    page = 1
+    page_size = 100
+    while True:
+
+        query = AzulApiPackagesQuery(
+            archive_type=AzulArchiveType.Zip,
+            release_status=AzulReleaseStatus.Ga,
+            availability_types=[AzulAvailabilityType.CA],
+            java_package_type=AzulJavaPackageType.Jre,
+            javafx_bundled=False,
+            latest=True,
+            page=page,
+            page_size=page_size,
+        )
+        api_call = azulApiPackagesUrl(query=query)
+
+        print("Processing Page:", page, api_call)
+
+        r = sess.get(api_call)
+        if r.status_code == 404:
+            break
+        else:
+            r.raise_for_status()
+
+        packages = list(ZuluPackage(**pkg) for pkg in r.json())
+        zulu_packages.extend(packages)
+        if len(packages) < page_size:
+            break
+        page += 1
+
+    print("Total Azul Packages:", len(zulu_packages))
+    packages = ZuluPackageList(__root__=zulu_packages)
+    azul_manifest_file = os.path.join(UPSTREAM_DIR, AZUL_DIR, "packages.json")
+    packages.write(azul_manifest_file)
+
+    azul_major_versions: dict[int, ZuluPackagesDetail] = {}
+
+    for _, pkg in packages:
+
+        major_version = pkg.java_version[0]
+        if major_version not in azul_major_versions:
+            azul_major_versions[major_version] = ZuluPackagesDetail(__root__=[])
+
+        pkg_file = os.path.join(
+            UPSTREAM_DIR, AZUL_VERSIONS_DIR, f"{pkg.package_uuid}.json"
+        )
+        if os.path.exists(pkg_file) and os.path.isfile(pkg_file):
+            pkg_detail = ZuluPackageDetail.parse_file(pkg_file)
+            azul_major_versions[major_version].append(pkg_detail)
+        else:
+
+            api_call = azulApiPackageDetailUrl(pkg.package_uuid)
+            print("Fetching Azul package manifest:", pkg.package_uuid)
+            r_pkg = sess.get(api_call)
+            r_pkg.raise_for_status()
+
+            pkg_detail = ZuluPackageDetail(**r_pkg.json())
+            pkg_detail.write(pkg_file)
+            azul_major_versions[major_version].append(pkg_detail)
+
+    for major in azul_major_versions:
+        major_file = os.path.join(UPSTREAM_DIR, AZUL_VERSIONS_DIR, f"java{major}.json")
+        azul_major_versions[major].write(major_file)
+
+
+if __name__ == "__main__":
+    main()
+#
diff --git a/meta/meta/run/update_liteloader.py b/meta/meta/run/update_liteloader.py
new file mode 100755
index 0000000000..383644754d
--- /dev/null
+++ b/meta/meta/run/update_liteloader.py
@@ -0,0 +1,37 @@
+import json
+import os
+
+from meta.common import upstream_path, ensure_upstream_dir, default_session
+from meta.common.liteloader import VERSIONS_FILE, BASE_DIR
+from meta.model.liteloader import LiteloaderIndex
+
+UPSTREAM_DIR = upstream_path()
+
+ensure_upstream_dir(BASE_DIR)
+
+sess = default_session()
+
+
+def main():
+    # get the remote version list
+    r = sess.get("http://dl.liteloader.com/versions/versions.json")
+    r.raise_for_status()
+
+    # make sure it's JSON
+    main_json = r.json()
+
+    # make sure we understand the schema
+    remote_versions = LiteloaderIndex.parse_obj(main_json)
+    parsed = remote_versions.json()
+    original = json.dumps(main_json, sort_keys=True, indent=4)
+    assert parsed == original
+
+    print("Successfully parsed index")
+    print(f"Last updated {remote_versions.meta.updated}")
+
+    # save the json it to file
+    remote_versions.write(os.path.join(UPSTREAM_DIR, VERSIONS_FILE))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/meta/meta/run/update_mojang.py b/meta/meta/run/update_mojang.py
new file mode 100755
index 0000000000..c05b15ce46
--- /dev/null
+++ b/meta/meta/run/update_mojang.py
@@ -0,0 +1,199 @@
+import concurrent.futures
+import json
+import os
+import zipfile
+
+from meta.common import upstream_path, ensure_upstream_dir, default_session
+from meta.common.http import download_binary_file
+from meta.common.mojang import (
+    BASE_DIR,
+    VERSION_MANIFEST_FILE,
+    VERSIONS_DIR,
+    ASSETS_DIR,
+    STATIC_EXPERIMENTS_FILE,
+    STATIC_OLD_SNAPSHOTS_FILE,
+    JAVA_MANIFEST_FILE,
+)
+from meta.model.mojang import (
+    MojangIndexWrap,
+    MojangIndex,
+    ExperimentIndex,
+    ExperimentIndexWrap,
+    OldSnapshotIndexWrap,
+    OldSnapshotIndex,
+    JavaIndex,
+)
+
+UPSTREAM_DIR = upstream_path()
+
+ensure_upstream_dir(BASE_DIR)
+ensure_upstream_dir(VERSIONS_DIR)
+ensure_upstream_dir(ASSETS_DIR)
+
+sess = default_session()
+
+
+def fetch_zipped_version(path, url):
+    zip_path = f"{path}.zip"
+    download_binary_file(sess, zip_path, url)
+    with zipfile.ZipFile(zip_path) as z:
+        for info in z.infolist():
+            if info.filename.endswith(".json"):
+                print(f"Found {info.filename} as version json")
+                version_json = json.load(z.open(info))
+                break
+
+    assert version_json
+
+    version_json["type"] = "experiment"
+
+    with open(path, "w", encoding="utf-8") as f:
+        json.dump(version_json, f, sort_keys=True, indent=4)
+
+    return version_json
+
+
+def fetch_modified_version(path, version):
+    r = sess.get(version.url)
+    r.raise_for_status()
+    version_json = r.json()
+
+    version_json["releaseTime"] = version_json["releaseTime"] + "T00:00:00+02:00"
+    version_json["time"] = version_json["releaseTime"]
+
+    downloads = {
+        "client": {"url": version.jar, "sha1": version.sha1, "size": version.size}
+    }
+
+    version_json["downloads"] = downloads
+    version_json["type"] = "old_snapshot"
+
+    with open(path, "w", encoding="utf-8") as f:
+        json.dump(version_json, f, sort_keys=True, indent=4)
+
+    return version_json
+
+
+def fetch_version(path, url):
+    r = sess.get(url)
+    r.raise_for_status()
+    version_json = r.json()
+
+    with open(path, "w", encoding="utf-8") as f:
+        json.dump(version_json, f, sort_keys=True, indent=4)
+
+    return version_json
+
+
+MOJANG_JAVA_URL = "https://piston-meta.mojang.com/v1/products/java-runtime/2ec0cc96c44e5a76b9c8b7c39df7210883d12871/all.json"
+
+
+def update_javas():
+    r = sess.get(MOJANG_JAVA_URL)
+    r.raise_for_status()
+
+    remote_javas = JavaIndex(__root__=r.json())
+
+    java_manifest_path = os.path.join(UPSTREAM_DIR, JAVA_MANIFEST_FILE)
+
+    remote_javas.write(java_manifest_path)
+
+
+def fetch_version_concurrent(remote_versions, x):
+    version = remote_versions.versions[x]
+    print(
+        "Updating "
+        + version.id
+        + " to timestamp "
+        + version.release_time.strftime("%s")
+    )
+    fetch_version(os.path.join(UPSTREAM_DIR, VERSIONS_DIR, f"{x}.json"), version.url)
+
+
+def fetch_modified_version_concurrent(old_snapshots, x):
+    version = old_snapshots.versions[x]
+    old_snapshots_path = os.path.join(UPSTREAM_DIR, VERSIONS_DIR, f"{x}.json")
+
+    print("Updating old snapshot " + version.id)
+    if not os.path.isfile(old_snapshots_path):
+        fetch_modified_version(old_snapshots_path, version)
+    else:
+        print("Already have old snapshot " + version.id)
+
+
+def main():
+    # get the remote version list
+    r = sess.get("https://piston-meta.mojang.com/mc/game/version_manifest_v2.json")
+    r.raise_for_status()
+
+    remote_versions = MojangIndexWrap(MojangIndex(**r.json()))
+    remote_ids = set(remote_versions.versions.keys())
+
+    version_manifest_path = os.path.join(UPSTREAM_DIR, VERSION_MANIFEST_FILE)
+
+    if os.path.exists(version_manifest_path):
+        # get the local version list
+        current_versions = MojangIndexWrap(
+            MojangIndex.parse_file(version_manifest_path)
+        )
+        local_ids = set(current_versions.versions.keys())
+
+        # versions not present locally but present remotely are new
+        pending_ids = remote_ids.difference(local_ids)
+
+        for x in local_ids:
+            remote_version = remote_versions.versions[x]
+            local_version = current_versions.versions[x]
+            if remote_version.time > local_version.time:
+                pending_ids.add(x)
+    else:
+        pending_ids = remote_ids
+
+    with concurrent.futures.ThreadPoolExecutor() as executor:
+        futures = [
+            executor.submit(fetch_version_concurrent, remote_versions, x)
+            for x in pending_ids
+        ]
+        for f in futures:
+            f.result()
+
+    # deal with experimental snapshots separately
+    if os.path.exists(STATIC_EXPERIMENTS_FILE):
+        experiments = ExperimentIndexWrap(
+            ExperimentIndex.parse_file(STATIC_EXPERIMENTS_FILE)
+        )
+        experiment_ids = set(experiments.versions.keys())
+
+        for x in experiment_ids:
+            version = experiments.versions[x]
+            experiment_path = os.path.join(UPSTREAM_DIR, VERSIONS_DIR, f"{x}.json")
+
+            print("Updating experiment " + version.id)
+            if not os.path.isfile(experiment_path):
+                fetch_zipped_version(experiment_path, version.url)
+            else:
+                print("Already have experiment " + version.id)
+
+    # deal with old snapshots
+    if os.path.exists(STATIC_OLD_SNAPSHOTS_FILE):
+        old_snapshots = OldSnapshotIndexWrap(
+            OldSnapshotIndex.parse_file(STATIC_OLD_SNAPSHOTS_FILE)
+        )
+        old_snapshots_ids = set(old_snapshots.versions.keys())
+
+        with concurrent.futures.ThreadPoolExecutor() as executor:
+            futures = [
+                executor.submit(fetch_modified_version_concurrent, old_snapshots, x)
+                for x in old_snapshots_ids
+            ]
+            for f in futures:
+                f.result()
+
+    remote_versions.index.write(version_manifest_path)
+
+    print("Getting Mojang Java runtime manfest")
+    update_javas()
+
+
+if __name__ == "__main__":
+    main()
diff --git a/meta/meta/run/update_neoforge.py b/meta/meta/run/update_neoforge.py
new file mode 100644
index 0000000000..9957aad1bd
--- /dev/null
+++ b/meta/meta/run/update_neoforge.py
@@ -0,0 +1,317 @@
+"""
+Get the source files necessary for generating Forge versions
+"""
+
+import concurrent.futures
+import copy
+import hashlib
+import json
+import os
+import re
+import zipfile
+from contextlib import suppress
+from datetime import datetime
+from pathlib import Path
+from pprint import pprint
+import urllib.parse
+
+from pydantic import ValidationError
+
+from meta.common import (
+    upstream_path,
+    ensure_upstream_dir,
+    default_session,
+    remove_files,
+    eprint,
+    file_hash,
+    get_file_sha1_from_file,
+)
+from meta.common.http import download_binary_file
+from meta.common.neoforge import (
+    JARS_DIR,
+    INSTALLER_INFO_DIR,
+    INSTALLER_MANIFEST_DIR,
+    VERSION_MANIFEST_DIR,
+    FILE_MANIFEST_DIR,
+)
+from meta.model.neoforge import (
+    NeoForgeFile,
+    NeoForgeEntry,
+    NeoForgeMCVersionInfo,
+    DerivedNeoForgeIndex,
+    NeoForgeVersion,
+    NeoForgeInstallerProfileV2,
+    InstallerInfo,
+)
+from meta.model.mojang import MojangVersion
+
+UPSTREAM_DIR = upstream_path()
+
+ensure_upstream_dir(JARS_DIR)
+ensure_upstream_dir(INSTALLER_INFO_DIR)
+ensure_upstream_dir(INSTALLER_MANIFEST_DIR)
+ensure_upstream_dir(VERSION_MANIFEST_DIR)
+ensure_upstream_dir(FILE_MANIFEST_DIR)
+
+sess = default_session()
+
+
+def find_nth(haystack, needle, n):
+    start = haystack.find(needle)
+    while start >= 0 and n > 1:
+        start = haystack.find(needle, start + len(needle))
+        n -= 1
+    return start
+
+
+def get_single_forge_files_manifest(longversion, artifact: str):
+    print(f"Getting NeoForge manifest for {longversion}")
+    path_thing = UPSTREAM_DIR + "/neoforge/files_manifests/%s.json" % longversion
+    files_manifest_file = Path(path_thing)
+    from_file = False
+    if files_manifest_file.is_file():
+        with open(path_thing, "r") as f:
+            files_json = json.load(f)
+            from_file = True
+    else:
+        file_url = (
+            f"https://maven.neoforged.net/api/maven/details/releases/net%2Fneoforged%2F{artifact}%2F"
+            + urllib.parse.quote(longversion)
+        )
+        r = sess.get(file_url)
+        r.raise_for_status()
+        files_json = r.json()
+
+    ret_dict = dict()
+
+    for file in files_json.get("files"):
+        assert type(file) == dict
+        name = file["name"]
+        prefix = f"{artifact}-{longversion}"
+        assert name.startswith(
+            prefix
+        ), f"{longversion} classifier {name} doesn't start with {prefix}"
+        file_name = name[len(prefix) :]
+        if file_name.startswith("-"):
+            file_name = file_name[1:]
+        if file_name.startswith("."):
+            continue
+
+        classifier, ext = os.path.splitext(file_name)
+
+        if ext in [".md5", ".sha1", ".sha256", ".sha512"]:
+            continue
+
+        # assert len(extensionObj.items()) == 1
+        file_obj = NeoForgeFile(
+            artifact=artifact, classifier=classifier, extension=ext[1:]
+        )
+        ret_dict[classifier] = file_obj
+
+    if not from_file:
+        Path(path_thing).parent.mkdir(parents=True, exist_ok=True)
+        with open(path_thing, "w", encoding="utf-8") as f:
+            json.dump(files_json, f, sort_keys=True, indent=4)
+
+    return ret_dict
+
+
+def process_neoforge_version(key, entry):
+    eprint("Updating NeoForge %s" % key)
+
+    version = NeoForgeVersion(entry)
+    if version.url() is None:
+        eprint("Skipping %d with no valid files" % version.build)
+        return
+    if not version.uses_installer():
+        eprint(f"version {version.long_version} does not use installer")
+        return
+
+    jar_path = os.path.join(UPSTREAM_DIR, JARS_DIR, version.filename())
+
+    installer_info_path = (
+        UPSTREAM_DIR + "/neoforge/installer_info/%s.json" % version.long_version
+    )
+    profile_path = (
+        UPSTREAM_DIR + "/neoforge/installer_manifests/%s.json" % version.long_version
+    )
+    version_file_path = (
+        UPSTREAM_DIR + "/neoforge/version_manifests/%s.json" % version.long_version
+    )
+
+    new_sha1 = None
+    sha1_file = jar_path + ".sha1"
+    fileSha1 = get_file_sha1_from_file(jar_path, sha1_file)
+    try:
+        rfile = sess.get(version.url() + ".sha1")
+        rfile.raise_for_status()
+        new_sha1 = rfile.text.strip()
+        if fileSha1 != new_sha1:
+            remove_files([jar_path, profile_path, installer_info_path, sha1_file])
+    except Exception as e:
+        eprint("Failed to check sha1 %s" % version.url())
+        eprint("Error is %s" % e)
+
+    installer_refresh_required = not os.path.isfile(profile_path) or not os.path.isfile(
+        installer_info_path
+    )
+
+    if installer_refresh_required:
+        # grab the installer if it's not there
+        if not os.path.isfile(jar_path):
+            eprint("Downloading %s" % version.url())
+            try:
+                Path(jar_path).parent.mkdir(parents=True, exist_ok=True)
+                download_binary_file(sess, jar_path, version.url())
+            except Exception as e:
+                eprint("Failed to download %s" % version.url())
+                eprint("Error is %s" % e)
+                return
+            if new_sha1 is None:
+                try:
+                    rfile = sess.get(version.url() + ".sha1")
+                    rfile.raise_for_status()
+                    new_sha1 = rfile.text.strip()
+                except Exception as e:
+                    eprint("Failed to download new sha1 %s" % version.url())
+                    eprint("Error is %s" % e)
+            if new_sha1 is not None:  # this is in case the fetch failed
+                with open(sha1_file, "w") as file:
+                    file.write(new_sha1)
+
+    eprint("Processing %s" % version.url())
+    # harvestables from the installer
+    if not os.path.isfile(profile_path):
+        print(jar_path)
+        with zipfile.ZipFile(jar_path) as jar:
+            with suppress(KeyError):
+                with jar.open("version.json") as profile_zip_entry:
+                    version_data = profile_zip_entry.read()
+
+                    # Process: does it parse?
+                    MojangVersion.parse_raw(version_data)
+
+                    Path(version_file_path).parent.mkdir(parents=True, exist_ok=True)
+                    with open(version_file_path, "wb") as versionJsonFile:
+                        versionJsonFile.write(version_data)
+                        versionJsonFile.close()
+
+            with jar.open("install_profile.json") as profile_zip_entry:
+                install_profile_data = profile_zip_entry.read()
+
+                # Process: does it parse?
+                is_parsable = False
+                exception = None
+                try:
+                    NeoForgeInstallerProfileV2.parse_raw(install_profile_data)
+                    is_parsable = True
+                except ValidationError as err:
+                    exception = err
+
+                if not is_parsable:
+                    if version.is_supported():
+                        raise exception
+                    else:
+                        eprint(
+                            "Version %s is not supported and won't be generated later."
+                            % version.long_version
+                        )
+
+                Path(profile_path).parent.mkdir(parents=True, exist_ok=True)
+                with open(profile_path, "wb") as profileFile:
+                    profileFile.write(install_profile_data)
+                    profileFile.close()
+
+    # installer info v1
+    if not os.path.isfile(installer_info_path):
+        installer_info = InstallerInfo()
+        installer_info.sha1hash = file_hash(jar_path, hashlib.sha1)
+        installer_info.sha256hash = file_hash(jar_path, hashlib.sha256)
+        installer_info.size = os.path.getsize(jar_path)
+        installer_info.write(installer_info_path)
+
+
+def main():
+    # get the 1.20.1 remote version list fragments
+    r = sess.get(
+        "https://maven.neoforged.net/api/maven/versions/releases/net%2Fneoforged%2Fforge"
+    )
+    r.raise_for_status()
+    main_json = r.json()["versions"]
+    assert type(main_json) == list
+
+    # get the new remote version list fragments
+    r = sess.get(
+        "https://maven.neoforged.net/api/maven/versions/releases/net%2Fneoforged%2Fneoforge"
+    )
+    r.raise_for_status()
+    new_main_json = r.json()["versions"]
+    assert type(new_main_json) == list
+
+    main_json += new_main_json
+
+    new_index = DerivedNeoForgeIndex()
+
+    # let's keep the regex here to remove the 1.20.1-
+    version_expression = re.compile(
+        r"^(?P<mc>[0-9a-zA-Z_\.]+)-(?P<ver>[0-9\.]+\.(?P<build>[0-9]+))(-(?P<branch>[a-zA-Z0-9\.]+))?$"
+    )
+
+    print("")
+    print("Processing versions:")
+    for long_version in main_json:
+        assert type(long_version) == str
+
+        legacyMatch = version_expression.match(long_version)
+        if legacyMatch:
+            version = legacyMatch.group("ver")
+            artifact = "forge"
+        else:
+            version = long_version
+            artifact = "neoforge"
+
+        try:
+            files = get_single_forge_files_manifest(long_version, artifact)
+        except:
+            continue
+
+        # TODO: what *is* recommended?
+        is_recommended = False
+
+        entry = NeoForgeEntry(
+            artifact=artifact,
+            long_version=long_version,
+            version=version,
+            # NOTE: we add this later after the fact. The forge promotions file lies about these.
+            latest=False,
+            recommended=is_recommended,
+            files=files,
+        )
+        new_index.versions[long_version] = entry
+
+        if entry.recommended:
+            new_index.recommended = long_version
+
+    print("")
+    print("Dumping index files...")
+
+    with open(
+        UPSTREAM_DIR + "/neoforge/maven-metadata.json", "w", encoding="utf-8"
+    ) as f:
+        json.dump(main_json, f, sort_keys=True, indent=4)
+
+    new_index.write(UPSTREAM_DIR + "/neoforge/derived_index.json")
+
+    print("Grabbing installers and dumping installer profiles...")
+    # get the installer jars - if needed - and get the installer profiles out of them
+    with concurrent.futures.ThreadPoolExecutor() as executor:
+        futures = [
+            executor.submit(process_neoforge_version, key, entry)
+            for key, entry in new_index.versions.items()
+        ]
+        for f in futures:
+            f.result()
+
+
+if __name__ == "__main__":
+    main()
diff --git a/meta/meta/run/update_quilt.py b/meta/meta/run/update_quilt.py
new file mode 100755
index 0000000000..e694fd7b46
--- /dev/null
+++ b/meta/meta/run/update_quilt.py
@@ -0,0 +1,131 @@
+import concurrent.futures
+import json
+import os
+import zipfile
+from datetime import datetime
+
+from meta.common import (
+    upstream_path,
+    ensure_upstream_dir,
+    transform_maven_key,
+    default_session,
+)
+from meta.common.quilt import JARS_DIR, INSTALLER_INFO_DIR, META_DIR, USE_QUILT_MAPPINGS
+from meta.model.fabric import FabricJarInfo
+
+UPSTREAM_DIR = upstream_path()
+
+ensure_upstream_dir(JARS_DIR)
+ensure_upstream_dir(INSTALLER_INFO_DIR)
+ensure_upstream_dir(META_DIR)
+
+sess = default_session()
+
+
+def get_maven_url(maven_key, server, ext):
+    parts = maven_key.split(":", 3)
+    maven_ver_url = (
+        server + parts[0].replace(".", "/") + "/" + parts[1] + "/" + parts[2] + "/"
+    )
+    maven_url = maven_ver_url + parts[1] + "-" + parts[2] + ext
+    return maven_url
+
+
+def get_json_file(path, url):
+    with open(path, "w", encoding="utf-8") as f:
+        r = sess.get(url)
+        r.raise_for_status()
+        print(f"QUILT DEBUG {r.headers}")
+        version_json = r.json()
+        json.dump(version_json, f, sort_keys=True, indent=4)
+        return version_json
+
+
+def head_file(url):
+    r = sess.head(url)
+    r.raise_for_status()
+    return r.headers
+
+
+def get_binary_file(path, url):
+    with open(path, "wb") as f:
+        r = sess.get(url)
+        r.raise_for_status()
+        for chunk in r.iter_content(chunk_size=128):
+            f.write(chunk)
+
+
+def compute_jar_file(path, url):
+    # NOTE: Quilt Meta does not make any guarantees about Last-Modified.
+    # Always download the JAR file instead
+    jar_path = path + ".jar"
+    get_binary_file(jar_path, url)
+    tstamp = datetime.fromtimestamp(0)
+    with zipfile.ZipFile(jar_path) as jar:
+        allinfo = jar.infolist()
+        for info in allinfo:
+            tstamp_new = datetime(*info.date_time)
+            if tstamp_new > tstamp:
+                tstamp = tstamp_new
+
+    data = FabricJarInfo(release_time=tstamp)
+    data.write(path + ".json")
+
+
+def compute_jar_file_concurrent(component, it):
+    print(f"Processing {component} {it['version']} ")
+    jar_maven_url = get_maven_url(
+        it["maven"], "https://maven.quiltmc.org/repository/release/", ".jar"
+    )
+    compute_jar_file(
+        os.path.join(UPSTREAM_DIR, JARS_DIR, transform_maven_key(it["maven"])),
+        jar_maven_url,
+    )
+    print(f"Processing {component} {it['version']} Done")
+
+
+def get_json_file_concurrent(it):
+    print(f"Downloading JAR info for loader {it['version']} ")
+    maven_url = get_maven_url(
+        it["maven"], "https://maven.quiltmc.org/repository/release/", ".json"
+    )
+    get_json_file(
+        os.path.join(UPSTREAM_DIR, INSTALLER_INFO_DIR, f"{it['version']}.json"),
+        maven_url,
+    )
+
+
+def main():
+    # get the version list for each component we are interested in
+    components = ["loader"]
+    if USE_QUILT_MAPPINGS:
+        components.append("hashed")
+    for component in components:
+        index = get_json_file(
+            os.path.join(UPSTREAM_DIR, META_DIR, f"{component}.json"),
+            "https://meta.quiltmc.org/v3/versions/" + component,
+        )
+        with concurrent.futures.ThreadPoolExecutor() as executor:
+            futures = [
+                executor.submit(compute_jar_file_concurrent, component, it)
+                for it in index
+            ]
+            for f in futures:
+                f.result()
+
+    # for each loader, download installer JSON file from maven
+    with open(
+        os.path.join(UPSTREAM_DIR, META_DIR, "loader.json"), "r", encoding="utf-8"
+    ) as loaderVersionIndexFile:
+        loader_version_index = json.load(loaderVersionIndexFile)
+        with concurrent.futures.ThreadPoolExecutor() as executor:
+            futures = [
+                executor.submit(get_json_file_concurrent, it)
+                for it in loader_version_index
+            ]
+            for f in futures:
+                f.result()
+
+
+if __name__ == "__main__":
+    main()
diff --git a/meta/nix/dev.nix b/meta/nix/dev.nix
new file mode 100644
index 0000000000..1ca4edfc91
--- /dev/null
+++ b/meta/nix/dev.nix
@@ -0,0 +1,35 @@
+{
+  perSystem = {
+    config,
+    pkgs,
+    self',
+    ...
+  }: {
+    pre-commit.settings = {
+      excludes = ["flake.lock"];
+      hooks = {
+        markdownlint.enable = true;
+
+        alejandra.enable = true;
+        deadnix.enable = true;
+        nil.enable = true;
+
+        black.enable = true;
+      };
+    };
+
+    devShells.default = pkgs.mkShell {
+      shellHook = ''
+        ${config.pre-commit.installationScript}
+      '';
+
+      buildInputs = with pkgs; [
+        poetry
+      ];
+
+      inputsFrom = [self'.packages.default];
+    };
+
+    formatter = pkgs.alejandra;
+  };
+}
diff --git a/meta/nix/nixos/default.nix b/meta/nix/nixos/default.nix
new file mode 100644
index 0000000000..c4aa24174b
--- /dev/null
+++ b/meta/nix/nixos/default.nix
@@ -0,0 +1,10 @@
+{self, ...}: {
+  flake.nixosModules = {
+    default = self.nixosModules.meta;
+    meta = {
+      imports = [self.nixosModules.metaBare];
+      nixpkgs.overlays = [self.overlays.default];
+    };
+    metaBare = ./meta.nix;
+  };
+}
diff --git a/meta/nix/nixos/meta.nix b/meta/nix/nixos/meta.nix
new file mode 100644
index 0000000000..c03d4e6e01
--- /dev/null
+++ b/meta/nix/nixos/meta.nix
@@ -0,0 +1,70 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  inherit (lib) getExe getExe' mkEnableOption mkIf mkOption mkPackageOption types;
+
+  settingsFormat = pkgs.formats.keyValue {};
+
+  cfg = config.services.blockgame-meta;
+in {
+  options.services.blockgame-meta = {
+    enable = mkEnableOption "blockgame-meta service";
+
+    package = mkPackageOption pkgs "blockgame-meta" {};
+
+    settings = mkOption {
+      type = types.submodule {
+        freeformType = settingsFormat.type;
+        options = {
+          DEPLOY_TO_S3 = mkOption {
+            type = types.str;
+            default = "false";
+          };
+          DEPLOY_TO_FOLDER = mkOption {
+            type = types.str;
+            default = "false";
+          };
+          DEPLOY_TO_GIT = mkOption {
+            type = types.str;
+            default = "false";
+          };
+        };
+      };
+    };
+  };
+  config = mkIf cfg.enable {
+    users.users."blockgame-meta" = {
+      isSystemUser = true;
+      group = "blockgame-meta";
+    };
+
+    users.groups."blockgame-meta" = {};
+
+    systemd = {
+      services."blockgame-meta" = {
+        description = "blockgame metadata generator";
+        after = ["network-online.target"];
+        wants = ["network-online.target"];
+        serviceConfig = {
+          EnvironmentFile = [(settingsFormat.generate "blockgame-meta.env" cfg.settings)];
+          ExecStartPre = getExe' cfg.package "init";
+          ExecStart = getExe cfg.package;
+          StateDirectory = "blockgame-meta";
+          CacheDirectory = "blockgame-meta";
+          User = "blockgame-meta";
+        };
+      };
+
+      timers."blockgame-meta" = {
+        timerConfig = {
+          OnCalendar = "hourly";
+          RandomizedDelaySec = "5m";
+        };
+        wantedBy = ["timers.target"];
+      };
+    };
+  };
+}
diff --git a/meta/nix/packages.nix b/meta/nix/packages.nix
new file mode 100644
index 0000000000..4af7b97e5b
--- /dev/null
+++ b/meta/nix/packages.nix
@@ -0,0 +1,18 @@
+{inputs, ...}: {
+  imports = [inputs.flake-parts.flakeModules.easyOverlay];
+
+  perSystem = {
+    config,
+    final,
+    ...
+  }: {
+    packages = {
+      blockgame-meta = final.python3.pkgs.callPackage ./pkgs/blockgame-meta.nix {};
+      default = config.packages.blockgame-meta;
+    };
+
+    overlayAttrs = {
+      inherit (config.packages) blockgame-meta;
+    };
+  };
+}
diff --git a/meta/nix/pkgs/blockgame-meta.nix b/meta/nix/pkgs/blockgame-meta.nix
new file mode 100644
index 0000000000..8409c37cb4
--- /dev/null
+++ b/meta/nix/pkgs/blockgame-meta.nix
@@ -0,0 +1,70 @@
+{
+  lib,
+  buildPythonApplication,
+  poetry-core,
+  bash,
+  cachecontrol,
+  requests,
+  filelock,
+  git,
+  openssh,
+  packaging,
+  pydantic_1,
+  python,
+  rsync,
+}:
+buildPythonApplication {
+  pname = "blockgame-meta";
+  version = "unstable";
+
+  pyproject = true;
+
+  src = with lib.fileset;
+    toSource {
+      root = ../../.;
+      fileset = unions (map (fileName: ../../${fileName}) [
+        "meta"
+        "init.sh"
+        "pyproject.toml"
+        "poetry.lock"
+        "README.md"
+        "update.sh"
+      ]);
+    };
+
+  nativeBuildInputs = [
+    poetry-core
+  ];
+
+  buildInputs = [
+    bash
+  ];
+
+  propagatedBuildInputs = [
+    cachecontrol
+    requests
+    filelock
+    packaging
+    pydantic_1
+  ];
+
+  postInstall = ''
+    install -Dm755 $src/update.sh $out/bin/update
+    install -Dm755 $src/init.sh $out/bin/init
+
+    wrapProgram $out/bin/update \
+      --prefix PYTHONPATH : "$PYTHONPATH" \
+      --prefix PATH : ${lib.makeBinPath [git openssh python rsync]}
+
+    wrapProgram $out/bin/init \
+      --prefix PATH : ${lib.makeBinPath [git openssh]}
+  '';
+
+  meta = with lib; {
+    description = "Metadata generator for blockgame launcher.";
+    platforms = platforms.linux;
+    license = licenses.mspl;
+    maintainers = with maintainers; [Scrumplex];
+    mainProgram = "update";
+  };
+}
diff --git a/meta/poetry.lock b/meta/poetry.lock
new file mode 100644
index 0000000000..8bfa4c06b8
--- /dev/null
+++ b/meta/poetry.lock
@@ -0,0 +1,352 @@
+# This file is automatically @generated by Poetry 2.1.3 and should not be changed by hand.
+
+[[package]]
+name = "cachecontrol"
+version = "0.14.2"
+description = "httplib2 caching for requests"
+optional = false
+python-versions = ">=3.8"
+groups = ["main"]
+files = [
+    {file = "cachecontrol-0.14.2-py3-none-any.whl", hash = "sha256:ebad2091bf12d0d200dfc2464330db638c5deb41d546f6d7aca079e87290f3b0"},
+    {file = "cachecontrol-0.14.2.tar.gz", hash = "sha256:7d47d19f866409b98ff6025b6a0fca8e4c791fb31abbd95f622093894ce903a2"},
+]
+
+[package.dependencies]
+msgpack = ">=0.5.2,<2.0.0"
+requests = ">=2.16.0"
+
+[package.extras]
+dev = ["CacheControl[filecache,redis]", "build", "cherrypy", "codespell[tomli]", "furo", "mypy", "pytest", "pytest-cov", "ruff", "sphinx", "sphinx-copybutton", "tox", "types-redis", "types-requests"]
+filecache = ["filelock (>=3.8.0)"]
+redis = ["redis (>=2.10.5)"]
+
+[[package]]
+name = "certifi"
+version = "2024.2.2"
+description = "Python package for providing Mozilla's CA Bundle."
+optional = false
+python-versions = ">=3.6"
+groups = ["main"]
+files = [
+    {file = "certifi-2024.2.2-py3-none-any.whl", hash = "sha256:dc383c07b76109f368f6106eee2b593b04a011ea4d55f652c6ca24a754d1cdd1"},
+    {file = "certifi-2024.2.2.tar.gz", hash = "sha256:0569859f95fc761b18b45ef421b1290a0f65f147e92a1e5eb3e635f9a5e4e66f"},
+]
+
+[[package]]
+name = "charset-normalizer"
+version = "3.3.2"
+description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
+optional = false
+python-versions = ">=3.7.0"
+groups = ["main"]
+files = [
+    {file = "charset-normalizer-3.3.2.tar.gz", hash = "sha256:f30c3cb33b24454a82faecaf01b19c18562b1e89558fb6c56de4d9118a032fd5"},
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+
+[package.extras]
+dotenv = ["python-dotenv (>=0.10.4)"]
+email = ["email-validator (>=1.0.3)"]
+
+[[package]]
+name = "requests"
+version = "2.32.4"
+description = "Python HTTP for Humans."
+optional = false
+python-versions = ">=3.8"
+groups = ["main"]
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+certifi = ">=2017.4.17"
+charset_normalizer = ">=2,<4"
+idna = ">=2.5,<4"
+urllib3 = ">=1.21.1,<3"
+
+[package.extras]
+socks = ["PySocks (>=1.5.6,!=1.5.7)"]
+use-chardet-on-py3 = ["chardet (>=3.0.2,<6)"]
+
+[[package]]
+name = "typing-extensions"
+version = "4.11.0"
+description = "Backported and Experimental Type Hints for Python 3.8+"
+optional = false
+python-versions = ">=3.8"
+groups = ["main"]
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+[[package]]
+name = "urllib3"
+version = "2.2.1"
+description = "HTTP library with thread-safe connection pooling, file post, and more."
+optional = false
+python-versions = ">=3.8"
+groups = ["main"]
+files = [
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+]
+
+[package.extras]
+brotli = ["brotli (>=1.0.9) ; platform_python_implementation == \"CPython\"", "brotlicffi (>=0.8.0) ; platform_python_implementation != \"CPython\""]
+h2 = ["h2 (>=4,<5)"]
+socks = ["pysocks (>=1.5.6,!=1.5.7,<2.0)"]
+zstd = ["zstandard (>=0.18.0)"]
+
+[metadata]
+lock-version = "2.1"
+python-versions = "^3.8"
+content-hash = "2ed3cbaf03c118578cad2e4ea78c7baefeb741fae05c96472df8a4a59d97a9ae"
diff --git a/meta/public/.keep b/meta/public/.keep
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/meta/public/.keep
diff --git a/meta/pyproject.toml b/meta/pyproject.toml
new file mode 100644
index 0000000000..295d05a859
--- /dev/null
+++ b/meta/pyproject.toml
@@ -0,0 +1,39 @@
+[tool.poetry]
+name = "meta"
+version = "0.0.1"
+description = "Prism Launcher meta generator"
+authors = ["Sefa Eyeoglu <contact@scrumplex.net>"]
+license = "MS-PL"
+readme = "README.md"
+repository = "https://github.com/PrismLauncher/meta"
+documentation = "https://github.com/PrismLauncher/meta"
+keywords = ["metadata", "prism", "launcher"]
+
+[tool.poetry.scripts]
+generateFabric = "meta.run.generate_fabric:main"
+generateForge = "meta.run.generate_forge:main"
+generateLiteloader = "meta.run.generate_liteloader:main"
+generateMojang = "meta.run.generate_mojang:main"
+generateNeoForge = "meta.run.generate_neoforge:main"
+generateQuilt = "meta.run.generate_quilt:main"
+generateJava = "meta.run.generate_java:main"
+updateFabric = "meta.run.update_fabric:main"
+updateForge = "meta.run.update_forge:main"
+updateLiteloader = "meta.run.update_liteloader:main"
+updateMojang = "meta.run.update_mojang:main"
+updateNeoForge = "meta.run.update_neoforge:main"
+updateQuilt = "meta.run.update_quilt:main"
+updateJava = "meta.run.update_java:main"
+index = "meta.run.index:main"
+
+[tool.poetry.dependencies]
+python = "^3.8"
+cachecontrol = "^0.14.0"
+requests = "^2.31.0"
+filelock = "^3.13.1"
+packaging = "^25.0"
+pydantic = "^1.10.13"
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"
diff --git a/meta/renovate.json b/meta/renovate.json
new file mode 100644
index 0000000000..39a2b6e9a5
--- /dev/null
+++ b/meta/renovate.json
@@ -0,0 +1,6 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:base"
+  ]
+}
diff --git a/meta/update.sh b/meta/update.sh
new file mode 100755
index 0000000000..15df54e2b0
--- /dev/null
+++ b/meta/update.sh
@@ -0,0 +1,92 @@
+#!/usr/bin/env bash
+
+set -x
+
+if [ -f config.sh ]; then
+    source config.sh
+fi
+
+export META_CACHE_DIR=${CACHE_DIRECTORY:-./caches}
+export META_UPSTREAM_DIR=${META_UPSTREAM_DIR:-${STATE_DIRECTORY:-.}/upstream}
+export META_LAUNCHER_DIR=${META_LAUNCHER_DIR:-${STATE_DIRECTORY:-.}/launcher}
+
+function fail_in() {
+    upstream_git reset --hard HEAD
+    exit 1
+}
+
+function fail_out() {
+    launcher_git reset --hard HEAD
+    exit 1
+}
+
+function upstream_git() {
+    git -C "${META_UPSTREAM_DIR}" "$@"
+}
+
+function launcher_git() {
+    git -C "${META_LAUNCHER_DIR}" "$@"
+}
+
+# make sure we *could* push to our repo
+
+currentDate=$(date -I)
+
+upstream_git reset --hard HEAD || exit 1
+upstream_git pull
+
+python -m meta.run.update_mojang || fail_in
+python -m meta.run.update_forge || fail_in
+python -m meta.run.update_neoforge || fail_in
+python -m meta.run.update_fabric || fail_in
+python -m meta.run.update_quilt || fail_in
+python -m meta.run.update_liteloader || fail_in
+python -m meta.run.update_java || fail_in
+
+if [ "${DEPLOY_TO_GIT}" = true ]; then
+    upstream_git add mojang/version_manifest_v2.json mojang/java_all.json mojang/versions/* || fail_in
+    upstream_git add forge/*.json forge/version_manifests/*.json forge/installer_manifests/*.json forge/files_manifests/*.json forge/installer_info/*.json forge/jars/*.sha1 || fail_in
+    upstream_git add neoforge/*.json neoforge/version_manifests/*.json neoforge/installer_manifests/*.json neoforge/files_manifests/*.json neoforge/installer_info/*.json neoforge/jars/*.sha1 || fail_in
+    upstream_git add fabric/loader-installer-json/*.json fabric/meta-v2/*.json fabric/jars/*.json || fail_in
+    upstream_git add quilt/loader-installer-json/*.json quilt/meta-v3/*.json quilt/jars/*.json || fail_in
+    upstream_git add liteloader/*.json || fail_in
+    upstream_git add java_runtime/adoptium/available_releases.json java_runtime/adoptium/versions/*.json java_runtime/azul/packages.json java_runtime/azul/versions/*.json java_runtime/ibm/available_releases.json java_runtime/ibm/versions/*.json || fail_in
+    if ! upstream_git diff --cached --exit-code; then
+        upstream_git commit -a -m "Update ${currentDate}" || fail_in
+        upstream_git push || exit 1
+    fi
+fi
+
+launcher_git reset --hard HEAD || exit 1
+launcher_git pull
+
+python -m meta.run.generate_mojang || fail_out
+python -m meta.run.generate_forge || fail_out
+python -m meta.run.generate_neoforge || fail_out
+python -m meta.run.generate_fabric || fail_out
+python -m meta.run.generate_quilt || fail_out
+python -m meta.run.generate_liteloader || fail_out
+python -m meta.run.generate_java || fail_out
+python -m meta.run.index || fail_out
+
+if [ "${DEPLOY_TO_GIT}" = true ]; then
+    launcher_git add index.json org.lwjgl/* org.lwjgl3/* net.minecraft/* || fail_out
+    launcher_git add net.minecraftforge/* || fail_out
+    launcher_git add net.neoforged/* || fail_out
+    launcher_git add net.fabricmc.fabric-loader/* net.fabricmc.intermediary/* || fail_out
+    launcher_git add org.quiltmc.quilt-loader/* || fail_out # TODO: add Quilt hashed, once it is actually used
+    launcher_git add com.mumfrey.liteloader/* || fail_out
+    launcher_git add net.minecraft.java/* net.adoptium.java/* com.azul.java/* com.ibm.java/* || fail_out
+
+    if ! launcher_git diff --cached --exit-code; then
+        launcher_git commit -a -m "Update ${currentDate}" || fail_out
+        launcher_git push || exit 1
+    fi
+fi
+
+if [ "${DEPLOY_TO_FOLDER}" = true ]; then
+    echo "Deploying to ${DEPLOY_FOLDER}"
+    rsync -rvog --chown="${DEPLOY_FOLDER_USER}:${DEPLOY_FOLDER_GROUP}" --exclude=.git "${META_LAUNCHER_DIR}/" "${DEPLOY_FOLDER}"
+fi
+
+exit 0