Open Source Solid Modeling CAD
FlightGear Flight Simulator: free open-source multiplatform flight sim
3D Without Boundaries
Scanning Probe Microscopy Controller and Data Visualization Software
PyMOL is an OpenGL based molecular visualization system
3D game engine for C and C++
Pear3DEngine is a modern and modular 3D development framework
A simple web interface for Blender, for rendering animations..