FlightGear Flight Simulator: free open-source multiplatform flight sim
An interactive viewer for three-dimensional chemical structures.
CIRT - CUDA Interactive Ray Tracer
Rayshade raytracer
Tao3D is a programming language for real-time interactive 3D
3D Charts - Templates for PovRay(TM)
Program for drawing 3D surfaces from parametric equations
Perl bindings to the Modern OpenGL API
3D .NET engine for Windows, Linux, Mac
realtime 3d surface rendering library
Imagin Raytracer is a multithreaded command line raytracer
3D game engine for C and C++
Pear3DEngine is a modern and modular 3D development framework
Multi-Language Wrapper Collection for the Irrlicht Engine
Bruno's RAY Tracing Engine