scene-oriented, flexible 3D engine (C++, Python, C#, Java)
GemRB is a portable open-source implementation of the Infinity Engine
... the open-source glide computer
3D modeler, 3D game maker, 3D demo maker
PyMancala: A Python API for the Mancala game
The AWS GameKit Plugin for Unreal
ZED OS the clone of Windows XP
Character animation system for games and simulations.
A multiplatform Dart movie app with 40% of code sharing
Open-DIS implements the IEEE DIS protocol in multiple languages.
3D .NET engine for Windows, Linux, Mac
Free GPS tracking software for your workouts.
Files to hack Bike Race on iDevices By: Chad Dunn
A cross-platform OpenGL based lightweight scenegraph library