Desktop/Android/HTML5/iOS Java game development framework
RPG Maker 2000/2003 and EasyRPG games interpreter
A c++ public domain audio output class
Open RealStrategyGameLibrary (Engine)
A cross platform Lua based game engine
A 2D game engine and level editor
A SaveGame & Mii Manager for the Wii
A Smarter Way to Tag FLAC, Vorbis, Lyrics, WMA, WavPack, and ID3 Tags
Game engine for playing tomb raider 1 - 5 levels.
3D Game engine
TurboSphere is an easy to learn and powerful JS based game engine.
3D game engine for C and C++
Cross-platform 2D game engine
PSP Homebrew Game