SwiftShader is a high-performance CPU-based implementation
realistic driving simulation + functions for 2D/3D graphics
A customizable 3D platform for agent-based AI research
Cross-platform 2D and 3D game engine
3D Software Renderer in 700 Lines
realtime 3D data visualization
A really simple (following K.I.S.S statement) ray tracing project.
PHIGS (Programmer's Hierarchical Interactive Graphics System)
Multimedia asset management and manipulator for Étoilé
an interactive 3D viewing program
3D game engine for C and C++
smart car simulator
Access to Irrlicht Engine SDK from assembler, C, Python, Basic, Pascal
https://github.com/horde3d/Horde3D
Multi-Language Wrapper Collection for the Irrlicht Engine
A 3D rendering / entity engine