FreeCad è un software cad gratuito che puà sviluppare disegni in 2d e 3D. Questo software ha raggiunto un buon livello, da provare
Download piuttosto impegnativo: 25 Mbyte nella versione Windows.
Questo software è un Cad Gratis per Windows, oppure potrete sceglierlo nella versione Cad Gratis per Linux (Debian).
Link: Cad Gratis in Italiano
FreeCAD will be a general purpose 3D CAD modeler. The development will be completely Open Source. As with many modern 3D CAD modelers it will have a 2D component in order to extract design detail from the 3D model to create 2D production drawings, although 2D (e.g. AutoCAD LT) is not the focus, neither are animation and organic shapes (e.g. Maya, 3D StudioMAX and Cinema 4D).
FreeCAD is aimed directly at mechanical engineering, product design and related features like CatiaV4 and V5, SolidWorks and Solid Edge, and therefore also falls into the category of MCAD, PLM, CAx and CAE. It will be a feature based parametric modeler with a modular software architecture which makes it easy to provide additional functionality without modifying the core system.