Creates activity diagrams, class and object diagrams and communication diagrams.
Create diagrams in a manual mode or using free templates.
Umbrello UML Modeller is a Unified Modelling Language (UML) diagram program.
downloaded it it runs permanently on my PC and the results are great.
Thank you!
ModelSphere is open source since september 2008
See http://www.modelsphere.com/modelsphere.html