PUBLIC MARKS with tags tool & uml

Papyrus is a dedicated tool for modelling within UML2. This open source tool is based on the Eclipse environment.

Modélisation tools

creating UML diagrams for Actionscript and Flex projects

StarUML - The Open Source UML/MDA Platform StarUML is an open source project to develop fast, flexible, extensible, featureful, and freely-available UML/MDA platform running on Win32 platform. The goal of the StarUML project is to build a software modeling tool and also platform that is a compelling replacement of commercial UML tools such as Rational Rose, Together and so on.

Incredible, outstanding UML 2.0 editor. For windows only unfortunately.