Helix Toolkit is a collection of 3D components for .NET
Apache IoTDB
rayshade and POV for Mathematica Export + view
Highly accurate ray-tracing software system for UNIX computers
A WebGL-based 3D engine for technical visualization
3D Charts - Templates for PovRay(TM)
Pear3DEngine is a modern and modular 3D development framework
3-DPhysicsSim is an interactive 3-D physics simulator.
a realtime graphics library
PixelLight is a cross-platform application framework