The recently updated Autodesk Student Portal (http://students.autodesk.com) now hosts more software then ever (e.g. Revit, AutoCAD, 3ds Max, Maya, Ecotext and many others) and the license terms have been extended from 13 months to 3 years for most of the applications.
AutoCAD displays a banner on all printed material, but is otherwise complete and compatible. The Mac version should also become available "soon".
You can also try other of their flagship software, such as Inventor, Softimage, MotionBuilder or Mudbox if you are interested.