[Zope-dev] Best Free UML, XMI, Zope/Transwarp tools

I've been looking for a standard *FREE* tool that I can use to design Zope apps. I think my search is over. It seems to be a good tool for students because it's free and comes with support for Java, Persistence and XMI, Full and partial exchange. I wonder if Transwarp is at the point of being able to use UML/XMI stuff. Here is the URL for the UML tool http://www.ii.atos-group.com/rhone-alpes/Dom/english/ -Jimbo