C++ header-only library that simulates GLSL math
Xj3D is an open-source Java codebase for the X3D Graphics standard.
Rayshade raytracer
3D Charts - Templates for PovRay(TM)
rayshade 4.0.6 linux patch
Pear3DEngine is a modern and modular 3D development framework
A Lightweighted Toolkit For Volume Rendering
A C++ library to easily create GUI-editable objects
C++ class library for programming interactive 3D graphics with OpenGL