UML diagram software

[Going to Cali]

Does anyone know of any good free software for producing unl diagrams?

 

[BlackDragon]

This isn't too bad:
http://live.gnome.org/Dia/Download

Not sure if you'll need to download extra stuff for it though. Only ever used it at uni.

 

[numnutz]

Posideon UML - I think I had a community edition a while back? Written in Java so don't expect lightning performance.

http://www.gentleware.com/uml-software-community-edition.html

 

[GingerNinja1989]

Only a demo version for free, but IBM Rational Rose? Used it for current uni project.