FlightGear Flight Simulator: free open-source multiplatform flight sim
Open Source Solid Modeling CAD
3D modeler, 3D game maker, 3D demo maker
Video mixer for mixing live and recorded video and audio feeds
Spatilization tool in in 2D and 3D
Lightweight and modular C++11 graphics middleware for data and games
Free yourself
Graphical Interface for Medical Image Analysis and Simulation
Image processing framework to integrate EM software packages.
3D Engine technology with partial tools developing kit.