Game engine supporting many 3D/2D formats and graphic effects
Orx: Data-Driven Game Engine
Portable game engine with main focus on point-and-click adventures
Build Cross-platform Applications
C/C++ , PHP, PYTHON, 3D ENGINES, CHROME NATIVE CLIENT
3D .NET engine for Windows, Linux, Mac
C-Lesh is a game programming language for 2D games.
Make games with Lego-like building blocks