A shader-based software renderer written from scratch in C89
PyMOL is an OpenGL based molecular visualization system
A framework for distributed computing
3D .NET engine for Windows, Linux, Mac
Scenegraph System
XNA based game engine completely written in c#
Interactive visualization of DTI, HARDI and other complex imaging data
Webgl Engine
Pear3DEngine is a modern and modular 3D development framework
Game engine supporting many 3D/2D formats and graphic effects
diagrammatic 3D in a web browser using SVG
A simple web interface for Blender, for rendering animations..