FlightGear Flight Simulator: free open-source multiplatform flight sim
Versatile Commodore Emulator
Volumetric image processing software
Make installation of selected plugins, or files in to X-Plane
Create fabric designs for hand weaving
PyVE is image analysis and visualization environment
BlueSky Open Air Traffic sim, (Windows/Linux/Mac, Python 2.x based)
realistic truck simulator with 3D graphics done from zero
Simple Qt/C++ Project for learning simulation programming.