Desktop/Android/HTML5/iOS Java game development framework
One framework for creating powerful cross-platform games
Cinema Enters Game Console
Cross-platform 2D and 3D game engine
3D .NET engine for Windows, Linux, Mac
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
A cross-platform OpenGL based lightweight scenegraph library
A powerful cross-platform and open-source 3-D rendering engine.
The Objective-C Interactive Simulation Abstraction Layer