RPG Maker 2000/2003 and EasyRPG games interpreter
Orx: Portable Game Engine
Game/Scene Development System
mGSTEP port of the Cube game engine
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
TurboSphere is an easy to learn and powerful JS based game engine.
3D game engine for C and C++