Godot is a powerful cross-platform game engine
Stream switch games to your PC via USB or network
A cross-platform PSP emulator
A simple and easy-to-use library to enjoy videogames programming
Xash3D FWGS engine
UCI chess engine
Desktop/Android/HTML5/iOS Java game development framework
One framework for creating powerful cross-platform games
Do virtual gear shifting (and more) in any rider app
RetroArch is a frontend for emulators, game engines and media players.
Open source voxel game engine with support for survival and crafting
Sandbox video game with a powerful physics engine
Open-source Android/Desktop remake of Civ V
Home theater software and entertainment hub for digital media
Voxel game-creation platform with easy modding and game creation
Open source HTML5 game framework that offers WebGL and Canvas
The game engine for everyone
Netcode that provides networking capabilities to GameObject workflows
The source code to VVVVVV
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Multi-platform 2D and 3D game engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
An open source reimplementation of the Among Us Server
A dead simple 2D game engine for Go
Free, cross-platform 2D game engine powered by Haxe and OpenFL