General Mission Analysis Tool
Physically accurate and validated GPU ray-tracer
FEATool Multiphysics is an easy-to-use FEA and CFD Simulation Toolbox
Static and Dynamic Structural Analysis of 2D and 3D frames.
The DREAM toolbox is a free open source acoustic field simulation tool
SPHERES Facility software for scientists
MIT's spacecraft simulator for control algorithm development
collection of illustrative programs:small games, simulators: C, Matlab
Toolkit for Automatic Control and Dynamic Optimization