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