>> If you want an opensource cad app, try... >> http://www.qcad.org/qcad.html >> http://www.brlcad.org/ >> http://archimedes.incubadora.fapesp.br/portal Problem is in comparisons. Blender is 3D solid (shell) modeling Other Cads are 2D and not particularly relevant in the 3D discussion. None come within a galaxy width of Blender. Roger