JavaScript 3D library
Real-time physically based rendering engine for Android, iOS, and more
crossplatform multithreaded object-oriented render and audio engine
An interactive viewer for three-dimensional chemical structures.
rayshade and POV for Mathematica Export + view
Megalui: 2D/3D OpenGL & C/C++ Library for Scientific Visualizations
Game engine supporting many 3D/2D formats and graphic effects