Based on the raedwulf-et project
Generates custom astrolabe EPS files
Open source first/third person shooter set in real world locations
Realtime 3D engine for game development
The Atomic Game Engine is a multi-platform 2D and 3D engine
Advanced rhythm game for Windows, Linux and OS X
extremely simple and low-fi multiplatform strategy game
A public domain cross platform 3D game
3D .NET engine for Windows, Linux, Mac
Multi-platform game engine similar to old Megaman with a stage editor
Turbulenz is a modular 3D and 2D game framework
Open Game Bootstrap
A traditional top-down OpenGL car racing game
Educational framework for OpenGLES, OpenCL and OpenAL
Cross-platform C framework very compact libraries and tools.
A generic 2D engine for any kind of game
a "yahtzee-like" game in c
The IRC's Talking Robot
C++ Text Adventure Engine