A Cross Platform and Open Source Electronics Design Automation Suite
BoltGenerator is an automated CAD tool which produces 3D bolts.
Open DXFs with QCad
Free multiphysics simulation software package
An Open source Analysis and SImulation Toolbox for Fuel Cells
A package for Isogeometric Analysis in Octave and Matlab
Cuts 3D objects from polystyrene foam (EPS/XPS)