I like Visual Paradigm for UML CASE tool!

Your site introduce Visual Paradigm for UML is much better than the Argo UML and more stable and I just downoaded a copy. I found it is a well design and user friendly UML free tool and yet, it is free, thinks for the reviewer for you site.

http://www.visual-paradigm.com

I highly recommend VP-UML to you!

Ming