Open Source Solid Modeling CAD
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
A performant, flexible, and easy-to-use real-time 3D rendering engine
3D tree generator
Pear3DEngine is a modern and modular 3D development framework
QCSS Player by Shuffle
A library to create anaglyph images with Java
A 3D rendering / entity engine
Bruno's RAY Tracing Engine