Godot Engine – Multi-platform 2D and 3D game engine

Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies

A refreshingly simple data-driven game engine built in Rust

Desktop/Android/HTML5/iOS Java game development framework

Babylon.js is a powerful, beautiful, simple, and open game and rendering engine packed into a friendly JavaScript framework.

🎮 A list of popular/awesome video games, add-ons, maps, etc. hosted on GitHub. Any genre. Any platform. Any engine.

A simple and easy-to-use library to enjoy videogames programming

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.

🅰️ Web framework for building virtual reality experiences.

A retro game engine for Python

Open Source real-time strategy game engine for early Westwood games such as Command & Conquer: Red Alert written in C# using SDL and OpenGL. Runs on Windows, Linux, *BSD and Mac OS X.

🎮 📝 A list of Game Development resources to make magic happen.

Free (as in freedom) open source clone of the Age of Empires II engine 🚀

One framework for creating powerful cross-platform games.

🎮 Open-source, cross-platform 2D/3D/multiplayer game engine designed for everyone.

Ebitengine - A dead simple 2D game engine for Go

Luanti (formerly Minetest) is an open source voxel game-creation platform with easy modding and game creation

An open source re-implementation of Diablo 2

Gaming meets modern C++ - a fast and reliable entity component system (ECS) and much more

State Management and Multiplayer Networking for Turn-Based Games