Fast PlayStation 1 emulator for x86-64/AArch32/AArch64
A cross-platform PSP emulator
SDL library for Android, including several games.
Voxel game-creation platform with easy modding and game creation
Desktop/Android/HTML5/iOS Java game development framework
UCI chess engine
A certain block game
Stream switch games to your PC via USB or network
The game engine for everyone
Tool to statically recompile N64 games into native executables
Home theater software and entertainment hub for digital media
Open-source engine for Heroes of Might and Magic III
Solar2D Game Engine main repository (ex Corona SDK)
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Multi-platform 2D and 3D game engine
Cocos simplifies game creation and distribution with Cocos Creator
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Android, UIQ 3.0, Series 60 Edition 5 open-source software
... the open-source glide computer
3D Engine c++
3D modeler, 3D game maker, 3D demo maker
Modern Windows-optimized fork of the FCEUX NES/Famicom emulator.