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
Open source library for creative expression on the web, desktop, etc.
Orx: Portable Game Engine
3D .NET engine for Windows, Linux, Mac
Hungry Hero is an open source Flash game built on Starling Framework.
Cross-platform 2D game engine