Me?
I use a program called Solid Edge. It was what Glasgow Uni used at the time I was there and they could offer licenses for the academic version for £5. However I would say that Solidworks is better and more widely accepted in industry; I think I'm going to try and transfer over to that at some point for all my CAD work.

Depending on how you feel about the moral aspect, you could always ask someone nicely if they could download an...ahem... legal copy of one of those programs and burn it to disc for you to install, but if anyone asks, I didn't tell you that :wink: