UML2 modelling tool

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

An open source initiative that develops metamodelling and modelling tools. It is based on Eclipse EMF, GMF, and UML2.

The Eclipse UML2 Tool provides a GMF-based implementation of UML2 diagramming for the UML2 model. This is the UML editor you can use with ease with Eclipse.

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.