There is always something to do for Umbrello UML Modeller. You can find an
up-to-date list of remaining bugs in the bug tracker system at:

http://bugs.trinitydesktop.org/

If you do not like chasing bugs you can add an incredible new feature. To get
an idea what might be good feature look at the feature tracker system:

http://bugs.trinitydesktop.org/

You can discuss a solution for a problem with the Umbrello developers at the
Umbrello developer's mailing list:

uml-devel@lists.sourceforge.net

If you want to translate Umbrello to another language please join the relevant KDE translation team:

http://i18n.kde.org/

Finally, to get an overview look at the home page:

http://uml.sourceforge.net/