Real-time 3D visualization of space
QCSS Player by Shuffle
A Lightweighted Toolkit For Volume Rendering
https://github.com/horde3d/Horde3D
3d printing software
Multi-Language Wrapper Collection for the Irrlicht Engine
Displays your photos on the walls of a maze
A C++ library to easily create GUI-editable objects
Bruno's RAY Tracing Engine
Obsolete: use https://github.com/VMML/vmmlib