Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
Prerenders static HTML in a single-page application
Panda3d to Tcl bindings
Implemention of SGI's Open Inventor.
3D Software Renderer in 700 Lines
A framework for distributed computing
free implementation of the OpenGL Character Renderer
3D Charts - Templates for PovRay(TM)
A Realistic and Rich 3D Environment
Program for drawing 3D surfaces from parametric equations
Generator of the Mandelbrot family fractals
Audio spectrum visualiser in 3D for Linux
LithoGraphX, 3D data analysis and visualization
JavaScript helpers for rendering high-resolution image variants
Tiny but powerful single file wavefront obj loader
Coin3D Qt GUI Library
Gphoton in a simple 3d modeler and ray tracer.