Desktop/Android/HTML5/iOS Java game development framework
Open source HTML5 game framework that offers WebGL and Canvas
One framework for creating powerful cross-platform games
A simple and easy-to-use library to enjoy videogames programming
Netcode that provides networking capabilities to GameObject workflows
Multi-platform 2D and 3D game engine
Free, cross-platform 2D game engine powered by Haxe and OpenFL
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Open source library for creative expression on the web, desktop, etc.
Old style soccer game with many exciting features
JavaScript framework to build game engines, games, emulators and apps
Cinema Enters Game Console
Open-source, cross-platform, C++ game engine for creating 2D/3D games
Modern AS3 Game Engine
3D .NET engine for Windows, Linux, Mac
Hungry Hero is an open source Flash game built on Starling Framework.