- godot by godotengine, 120k stars. Multi-platform 2D and 3D game engine
- Claude-Code-Game-Studios by Donchitos, 39k stars. Set of 49 agents and 72 skills that organize Claude Code into a game studio
- Babylon.js by BabylonJS, 26k stars. 3D rendering and game engine for the web built on WebGL
- WaveFunctionCollapse by mxgmn, 26k stars. C# procedural generator that builds bitmaps and tilemaps from one sample image
- pyxel by kitao, 19k stars. Retro game engine for making pixel-art games in Python
- unity-mcp by CoplayDev, 16k stars. MCP server that lets AI assistants control the Unity Editor
- JoltPhysics by jrouwe, 12k stars. Multi-core rigid body physics and collision library in C++ for games and VR
- GameNetworkingSockets by ValveSoftware, 10k stars. C++ library for reliable UDP messaging with encryption and NAT traversal
- universal-modder by rehan-remade, 9.7k stars. Claude Code skills and fal MCP tools for modding PC games you own
- pixelfx by patch-gg, 7.5k stars. Collection of 244 pixel art effects in JavaScript plus a Claude Code skill
- godogen by htdt, 7.3k stars. Autonomous Godot game development driven by Claude Code and Codex
- sbox-public by Facepunch, 6.5k stars. Source code for the s&box game engine built on Source 2 and .NET
- Unity-MCP by IvanMurzak, 4.6k stars. MCP server and CLI that lets AI agents build and test Unity projects
- ppf-contact-solver by st-tech, 4.6k stars. Contact solver for cloth, solid, rod, rigid body and sand physics simulation
- sprite-gen by aldegad, 4.1k stars. Pipeline that generates and cleans 2D sprite sheets into runtime animation atlases
- fheroes2 by ihhub, 3.7k stars. Open source engine reimplementing Heroes of Might and Magic II
- FModel by 4sval, 3.4k stars. Explorer for Unreal Engine game archives and assets
- BRUTAL by ahwootech, 2.5k stars. C# framework for games and game engines with direct Vulkan access
- Claw3D by iamlukethedev, 2.5k stars. Open source 3D engine for games, simulations and interactive 3D apps
- kaplay by kaplayjs, 1.8k stars. JavaScript and TypeScript game library for building 2D games
- REDox by CAPCOM-TD-OSS, 1.8k stars. Token-based structured data engine for .NET used in a game engine
- gorest-2d-animation-spritesheet-generator by NO6KIKO, 1.5k stars. Local tool for generating 2D animation spritesheets and composing scenes
- Wiicompiled by patchzyy, 1.4k stars. Wiicompiled
- iw4L by vladtrc, 1.2k stars. Experimental standalone Call of Duty runtime built on bevy and wgpu
- DLSS5-Feeder by jlrouzies-fr, 1.2k stars. Feeds synthetic DLAA inputs so DLSS 5 can run in games without DLSS
- OpenDLSS-NR by maanHimself, 1.0k stars. Vulkan port of NVIDIA's DLSS neural rendering network, matching the original output
- libsm64 by libsm64, 971 stars. Mario 64 packaged as a C library for embedding in game engines
- usagi by brettchalupa, 882 stars. 2D game engine for rapid prototyping in Lua with live reload and export
- Hermes3D by iamlukethedev, 785 stars. Open source 3D engine for games, simulations and interactive 3D apps
- UniText by LightSideKittens, 719 stars. Unity text rendering engine with emoji and multi-language support
- polyfork-catalog by lucas-martinic, 717 stars. Index of 2,700+ free low-poly GLB models for three.js and games
- aseprite-ai-artist by with-pebbly, 694 stars. MCP server and skills that let coding agents draw pixel art in Aseprite
- AlayaRenderer by AlayaLab, 653 stars. Diffusion-based neural renderer for game and virtual world scenes
- anymove by patch-gg, 593 stars. Fits a rig to an animal from AI video using two camera views and exports GLB
- pathetic by bsommerfeld, 396 stars. Java pathfinding library using A* on grids
- Duke-RT by postmemetic, 258 stars. Ray traced rendering added to the Raze engine for Duke 3D
- gta2-rtx-remix by gebdag, 224 stars. RTX Remix based renderer replacement for the original GTA2 game
- project-hedra by maxilevi, 196 stars. 3D open world game written in C# with OpenGL, around 100k lines of code
- ArcadeMaker by ArcadeMakerSources, 162 stars. Cross-platform 2D game engine with its own language and IDE
- parin by Kapendev, 148 stars. Small cross-platform 2D game engine written in D
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