Desktop/Android/HTML5/iOS Java game development framework
Multi-platform 2D and 3D game engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Old style soccer game with many exciting features
Build Cross-platform Applications
Open-source, cross-platform, C++ game engine for creating 2D/3D games
PixelLight is a cross-platform application framework
Delphi-like IDE for cross-platform game development
An open multi-platform turn-based strategy game framework