I know AutoCAD doesn't have a mac version or OSS, but are there any other programs that do?

my CAD instructors said he's not particular about which version we use, so I just wanted to see if I could find one before I condemn myself to a semester in the MEEG computer lab. (at christmas I might get a certain upgrade as a birthday present, and that would include bootcamp so I could install windows~~~~~~~~ but I have classes to do between now and then so 8))