DraftSight ("Autocad" para Linux - Gratuito)

[Super Tux]

DraftSight: Professional-grade, free* CAD software

DraftSight lets professional CAD users, students and educators create, edit and view DWG files. DraftSight runs on Windows®, Mac® and Linux.

- http://www.3ds.com/pt/products/draftsight/free-cad-software/ 

Excelente! 

Mais um software de graça. Continuem no Janelas e na Maçã!