Cross-platform 2D and 3D game engine
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
Controls processing and daylight simulation with hierarchical models.
PyMOL is an OpenGL based molecular visualization system
Implemention of SGI's Open Inventor.
Program for drawing 3D surfaces from parametric equations
.NET wrapper for the Irrlicht Engine
Functy is a 3D graph drawing package that generates immediate results.
Scenegraph System
Design and Display Happy Cube solutions
Fernweh3D is an interactive audiovisual album by Termotank.
kicad 3D is aimed to add 3D realistic feature on kicad pcb CAD
A raytracing framework for optical/non-optical physics simulations
a java based software to convert 2D to 3D images.
An object oriented 3D graphics API on top of OpenGL
QCSS Player by Shuffle
3D modeling for everybody
https://github.com/horde3d/Horde3D
PNNL Waterfall Visualization Tool
Game engine supporting many 3D/2D formats and graphic effects
Obsolete: use https://github.com/VMML/vmmlib