Best Open Source game development Libraries
A curated list of the most popular GitHub repositories tagged with game development. Select any project to visualize its architecture and dive into the codebase using RepoMind's AI engine.
#1godotengine/godot
Godot Engine – Multi-platform 2D and 3D game engine
#2ocornut/imgui
Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies
#3bevyengine/bevy
A refreshingly simple data-driven game engine built in Rust
#4phaserjs/phaser
Phaser is a fun, free and fast 2D game framework for making HTML5 games for desktop and mobile web browsers, supporting Canvas and WebGL rendering.
#5raysan5/raylib
A simple and easy-to-use library to enjoy videogames programming
#6emilk/egui
egui: an easy-to-use immediate mode GUI in Rust that runs on both web and native
#74ian/GDevelop
🎮 Open-source, cross-platform 2D/3D/multiplayer game engine designed for everyone.
#8BabylonJS/Babylon.js
Babylon.js is a powerful, beautiful, simple, and open game and rendering engine packed into a friendly JavaScript framework.
#9libgdx/libgdx
Desktop/Android/HTML5/iOS Java game development framework
#10lettier/3d-game-shaders-for-beginners
🎮 A step-by-step guide to implementing SSAO, depth of field, lighting, normal mapping, and more for your 3D game.
#11cocos2d/cocos2d-x
Cocos2d-x is a suite of open-source, cross-platform, game-development tools utilized by millions of developers across the globe. Its core has evolved to serve as the foundation for Cocos Creator 1.x & 2.x.
#12aframevr/aframe
:a: Web framework for building virtual reality experiences.
#13kitao/pyxel
A retro game engine for Python
#14ellisonleao/magictools
:video_game: :pencil: A list of Game Development resources to make magic happen.
#15QianMo/Game-Programmer-Study-Notes
:anchor: 我的游戏程序员生涯的读书笔记合辑。你可以把它看作一个加强版的Blog。涉及图形学、实时渲染、编程实践、GPU编程、设计模式、软件工程等内容。Keep Reading , Keep Writing , Keep Coding.
#16jrouwe/JoltPhysics
A multi core friendly rigid body physics and collision detection library. Written in C++. Suitable for games and VR applications. Used by Horizon Forbidden West and Death Stranding 2.
#17godotengine/awesome-godot
A curated list of free/libre plugins, scripts and add-ons for Godot
#18cocos/cocos-engine
Cocos simplifies game creation and distribution with Cocos Creator, a free, open-source, cross-platform game engine. Empowering millions of developers to create high-performance, engaging 2D/3D games and instant web entertainment.
#19ValveSoftware/GameNetworkingSockets
Reliable & unreliable messages over UDP. Robust message fragmentation & reassembly. P2P networking / NAT traversal. Encryption.
#20Orama-Interactive/Pixelorama
Unleash your creativity with Pixelorama, a powerful and accessible open-source pixel art multitool. Whether you want to create sprites, tiles, animations, or just express yourself in the language of pixel art, this software will realize your pixel-perfect dreams with a vast toolbox of features. Available on Windows, Linux, macOS and the Web!
#21o3de/o3de
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D engine that enables developers and content creators to build AAA games, cinema-quality 3D worlds, and high-fidelity simulations without any fees or commercial obligations.
#22FyroxEngine/Fyrox
3D and 2D game engine written in Rust
#23jynew/jynew
JinYongLegend-like RPG Game Framework with full Modding support and 10+ hours playable samples of game.
#24pygame/pygame
🐍🎮 pygame (the library) is a Free and Open Source python programming language library for making multimedia applications like games built on top of the excellent SDL library. C, Python, Native, OpenGL.
#25dotnet/Silk.NET
The high-speed OpenGL, OpenCL, OpenAL, OpenXR, GLFW, SDL, Vulkan, Assimp, WebGPU, and DirectX bindings library your mother warned you about.
#26ultralight-ux/Ultralight
Lightweight, high-performance HTML renderer for game and app developers.
#27Nukem9/dlssg-to-fsr3
Adds AMD FSR 3 Frame Generation to games by replacing Nvidia DLSS Frame Generation (nvngx_dlssg).
#28Kavex/GameDev-Resources
:video_game: :game_die: A wonderful list of Game Development resources.
#29AlmasB/FXGL
Java / JavaFX / Kotlin Game Library (Engine)
#30autonomous-ai/openharness
The ultimate harness for coding agents and beyond. All your agents. All your machines. One command center. Start with code, then follow your curiosity and build across disciplines: CAD, circuits, robots, games and music.
#31CrossGL/crosstl
Universal Programming Language & Translator
#32zenstory-ai/novel-to-game
Agent skills for source-grounded novel-to-game adaptation (小说改编游戏 / story to game): cited design docs, target-runtime builds, evidence-based QA. Three playable browser examples. For Claude Code, Codex, and Kimi Code.
#33godot-go/godot-go
Go bindings for Godot 4.7 GDExtension API
#34JasonXuDeveloper/Nino
The fastest binary serializer for C#. Source-generated, zero-allocation: services, RPC, messaging, caching, storage, Unity and Godot.
#35Sun0fABeach/vue-phaser3
Vue 3 + Phaser 3 + Webpack Template
#36moorestech/moorestech
Animated open world automated factory game
#37SummerEngine/summer
The game engine built for AI. MCP server, CLI and skills that let any agent build, test and publish full games with Summer Engine.
#38adamkhalile/luau-docs-oracle
Best Roblox Luau Bug Checker and API Verifier 2026 DevForum MCP Tool
#39Arshispro/luau-tycoon-core
Roblox Restaurant Tycoon Backend Framework 2026: Modular Server-Authoritative Luau System