a parametric 3D CAD modeler
FEATool Multiphysics is an easy-to-use FEA and CFD Simulation Toolbox
3D/2D Concrete Reinforcement in Bentley MicroStation
cppcam is a 3D CAD app for drafting G-Code toolpaths for CNC Routers
Design your own pottery for 3D printing in full color
Free multiphysics simulation software package
3D CAM program for CNC mills/lathes
CNC machine code generation for 3D models
Cuts 3D objects from polystyrene foam (EPS/XPS)