aka ogre v2 - scene-oriented, flexible 3D C++ engine
Open Source Solid Modeling CAD
An interactive viewer for three-dimensional chemical structures.
Interactive 3D Layout Viewer for GDSII
3D Without Boundaries
Viewer and exporter for Unreal Engine 1-4 assets
Tao3D is a programming language for real-time interactive 3D
PyMOL is an OpenGL based molecular visualization system
3D Charts - Templates for PovRay(TM)
Pear3DEngine is a modern and modular 3D development framework
A simple web interface for Blender, for rendering animations..