Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Godot is a powerful cross-platform game engine
An open-source sandbox tower defense game
A certain block game
A cross-platform PSP emulator
A simple and easy-to-use library to enjoy videogames programming
Stream switch games to your PC via USB or network
Xash3D FWGS engine
UCI chess engine
Voxel game-creation platform with easy modding and game creation
One framework for creating powerful cross-platform games
Desktop/Android/HTML5/iOS Java game development framework
RetroArch is a frontend for emulators, game engines and media players.
Open source voxel game engine with support for survival and crafting
The game engine for everyone
Open source cross-platform multi-purpose game toolkit
Open-source Android/Desktop remake of Civ V
Home theater software and entertainment hub for digital media
Open source HTML5 game framework that offers WebGL and Canvas
The source code to VVVVVV
Sandbox video game with a powerful physics engine
Do virtual gear shifting (and more) in any rider app
Turn-based survival game set in a post-apocalyptic world.
Cocos simplifies game creation and distribution with Cocos Creator
Free, cross-platform 2D game engine powered by Haxe and OpenFL