Desktop/Android/HTML5/iOS Java game development framework
A free 3D game engine to create games and realtimes scenes for Windows
A real-time game development platform
Open-source, cross-platform, C++ game engine for creating 2D/3D games
Open Game Bootstrap
Cross-platform C framework very compact libraries and tools.
Kinect based controller.
Cross-platform reimplementation of AMOS BASIC (runtime)
Delphi-like IDE for cross-platform game development
Read and write PGN format and test moves for legality.
DREAM is an Open Source GCS