Avogadro libraries provide 3D rendering, visualization, and analysis
Source mirror of LLGL GitHub repository
A real-time 3D Engine written in Ada
A real-time 3D engine for DOS-talgics (see GLOBE_3D for new stuff !)
Shadow mapping in Qt3D using C++
Open Source graphic tool and alternative to Insane Bump
Gphoton in a simple 3d modeler and ray tracer.