We use Jude for simple UML diagramming, We don't do very extensive modeling or use any of the code generation features so we don't really stretch the tool very much. For the simple diagrams we do though we are quite happy with it.
It seems that the community edition of Jude can be used in commercial environments. From the JUDE FAQ:
Can I use JUDE/Community, the free
version of JUDE, for commercial
projects?
You can use the diagrams or
skeleton codes created by
JUDE/Community as long as you accept
END-USER LICENSE AGREEMENT. However,
it is recommended to use non-free
version, JUDE/Professional which
includes customer support.
(JUDE/Community has a restriction of
the printing function, and JUDE logo
will be printed on the printings.)