CIRT - CUDA Interactive Ray Tracer
Rayshade raytracer
A real time 3D graphics engine written in C++
Gphoton in a simple 3d modeler and ray tracer.
A performant, flexible, and easy-to-use real-time 3D rendering engine
realtime 3d surface rendering library
Read and run Cryptic Studios games .demo files
PHIGS (Programmer's Hierarchical Interactive Graphics System)
A raytracing framework for optical/non-optical physics simulations
Webgl Engine