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The choice of CAD may seem obvious: the one used by almost everyone is AutoCAD, then you might consider buying that. The problem is chiaramente il costo.
Ci sono diverse alternative gratuite più o meno valide, quello che però è indispensabile è la compatibilità tra il software che si sceglie e l'autocad.
Tre software CAD gratuiti che possono gestire file in formato AutoCAD (dwg) sono:

• A9CAD , nella versione freeware permette di (secondo il sito) di disegnare in 2D, leggere e scrivere file dwg, editare gli oggetti, gestire i layer e stampare, in inglese.
  
• InstaCAD , completamente freeware, permette anche di disegnare in 3D, in inglese, scaricabile da qui .
  
• WinCAD , completamente freeware, in Italiano.
• FreeCAD , 3D CAD, which can also be used in 2D. The website says it is developed primarily for use as a mechanical 3D CAD. There is also a portable version, downloadable from again thanks to winPenPack here.
  

WinCAD Of the three I prefer, however, may want to try to see how you would be better.

If you have time and desire you can do a search on the internet to find and try different CAD freeware, however we must remember that developing a CAD tool takes a long time, so difficult to find a good product full and free, easier to find updates with limited functions in the freeware version or lite (the If A9CAD).

software engineers