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