Umbrello

Umbrello UML Modeller is a Unified Modelling Language (UML) diagramming tool for KDE.

UML allows you to create diagrams of software and other systems in a standard format (www.uml.org).

Existing code files in various languages can be parsed and used in the diagrams. The available classes can be written to code files also in various languages.

The following diagram types are supported:

use case diagram
class diagram
sequence diagram
collaboration diagram
state diagram
activity diagram
component diagram
deployment diagram
entity relationship diagram

The projects home page is at uml.sourceforge.net. Mailing lists are:

Vision

Umbrello is in a good state, when you are able

to parse its source code,
to draw diagrams and explore its architecture, classes and code
make changes to it
and generate the code again out of its model, so that you are ready to compile it again.

Or in other words, when you can use Umbrello for developing and improving itself.