I've just created a new release of Gaphor, the GTK/GNOME UML modeling tool.

Gaphor is written in Python and aims for usability and extensibility. Gaphor has an UML 2.0 compliant data model.

New in 0.4.0:
- Action diagrams
- Interfaces
- No more C code
- even better look and feel

Requires gnome-python 2.0 or newer and DiaCanvas2 0.13.0.