[CentOS] Help with UML editor?

A colleague, using CentOS 5 64-bit, installed by me, asked me for the following 
assistance:

"The site I was trying to get to was http://www.eclipsedownload.com/. I 
downloaded the EclipseUML free version, but it's obviously not giving me the 
information I need.  I have Java packages in Eclipse that I would like to 
display in a class diagram to show how they relate to one another. 
Theoretically, we have/had licenses for the Omondo tool.  I believe the studio 
edition will do what I need.  If we have no licenses, I can download the tool I 
used previously (http://www.soyatec.com/main.php), but that may have been the 
cause of my Eclipse crashing.  Then again, it crashes once a day or so now, so 
I don't know if the Soyatec's eUML2 tool will make it any worse.

If you find another tool I can use or test, please let me know.  I could use it 
as soon as possible."


Thanks for any assistance.

Scott