A certain block game
Stream switch games to your PC via USB or network
A cross-platform PSP emulator
Desktop/Android/HTML5/iOS Java game development framework
UCI chess engine
Home theater software and entertainment hub for digital media
The game engine for everyone
Cocos simplifies game creation and distribution with Cocos Creator
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Voxel game-creation platform with easy modding and game creation
Mangos ZERO is a server for World of Warcraft
Multi-platform 2D and 3D game engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Open source simulation game based on Transport Tycoon Deluxe
Tool to statically recompile N64 games into native executables
Diablo build for modern operating systems
dhewm 3 main repository
3D Engine c++
SDL library for Android, including several games.
A free transportation simulator game
Old style soccer game with many exciting features
Android, UIQ 3.0, Series 60 Edition 5 open-source software
GemRB is a portable open-source implementation of the Infinity Engine