Well, not fully free, but very low budget: index cards and pencil. Seriously!
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus
Check this excellent article about a freeware desktop from my friend Bruno. It could help.
There's also a free UML Eclipse plugin available at omondo.com [ February 10, 2005: Message edited by: Jean-Louis Marechaux ]
/ JeanLouis<br /><i>"software development has been, is, and will remain fundamentally hard" (Grady Booch)</i><br /> <br />Take a look at <a href="http://www.epfwiki.net/wikis/openup/" target="_blank" rel="nofollow">Agile OpenUP</a> in the Eclipse community