Tiger Mountain Technologies

Interested in machines? Ever wish you had your own lathe or mill? I do. I found this very cool site that has some FREE CAD software that you can use to design, price and order custom parts over the net. Not exactly open source but VERY cool. I just download and installed the software and with the help of their audio tutorial I created a small flywheel. It was very interesting how the prices dropped as the qty went up.

http://www.emachineshop.com/

This would be a great learning tool for anyone looking to learn CAD.