FlightGear Flight Simulator: free open-source multiplatform flight sim
A collection of packages providing extra functionality for GNU Octave
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
Imagin Raytracer is a multithreaded command line raytracer
OpenGL Image Processing LIBrary
simple 3d scene viewer for windows/linux/android
Windows flexible and powerful screen grabber tool.
Cuts 3D objects from polystyrene foam (EPS/XPS)