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FEATool Multiphysics is an easy-to-use FEA and CFD Simulation Toolbox
Simple Road Design and Earthworks
cppcam is a 3D CAD app for drafting G-Code toolpaths for CNC Routers
Geometric kernel for CAD programs using an atomic approach
Design your own pottery for 3D printing in full color
Cuts 3D objects from polystyrene foam (EPS/XPS)