CIRT - CUDA Interactive Ray Tracer
Rayshade raytracer
A shader-based software renderer written from scratch in C89
Short C++/Java/C#/Python benchmark
A 3d rendering framework
PHIGS (Programmer's Hierarchical Interactive Graphics System)
3D game engine for C and C++
Multi-Language Wrapper Collection for the Irrlicht Engine
Megalui: 2D/3D OpenGL & C/C++ Library for Scientific Visualizations
Displays your photos on the walls of a maze
A 3D rendering / entity engine