One framework for creating powerful cross-platform games
Desktop/Android/HTML5/iOS Java game development framework
A simple and easy-to-use library to enjoy videogames programming
Examples of procedural geometry for Unity3D C#
Orx: Portable Game Engine
3D .NET engine for Windows, Linux, Mac
MultiLingual Interactive Fiction
Hungry Hero is an open source Flash game built on Starling Framework.
cross-platform 2d game engine
A cross-platform OpenGL based lightweight scenegraph library
Cross-platform 2D game engine
A powerful cross-platform and open-source 3-D rendering engine.