x3d render library is a 3d graphics framework with implementation of several useful rendering algorithms: a rasterization renderer(with implementation of both builtin software rendering & opengl hardware rendering); a path tracing renderer(cpu based)
x3d demoscene is a framework and tool chains dedicated in animation production. x3d render library is used for the rendering component
Seb's RayTracer is a 3D renderer. It runs on the command line, taking camera, scenery, and output information from an XML file. It is currently a personal project that only runs on Cygwin and Linux.