A cross-platform PSP emulator
Open-source engine for Heroes of Might and Magic III
Desktop/Android/HTML5/iOS Java game development framework
A certain block game
Stream switch games to your PC via USB or network
Voxel game-creation platform with easy modding and game creation
UCI chess engine
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
The game engine for everyone
Home theater software and entertainment hub for digital media
Solar2D Game Engine main repository (ex Corona SDK)
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Multi-platform 2D and 3D game engine
Cocos simplifies game creation and distribution with Cocos Creator
Android, UIQ 3.0, Series 60 Edition 5 open-source software
3D Engine c++
... the open-source glide computer
GemRB is a portable open-source implementation of the Infinity Engine
A promising chess program
3D modeler, 3D game maker, 3D demo maker
A catalog of free games relative to the Qore World universe.
GLScene Engine for Delphi & C++Builder VCL Windows 32/64
GameServer is a sophisticated, game server designed for online games
Old style soccer game with many exciting features