StarUML

StarUML: A comprehensive unified modeling language tool

StarUML is a powerful piece of software that bundles all the functions and components you need to create and edit UML projects.

The application has a modern, neatly organized interface that makes it easy to view, build and explore your models, as well as see the properties of the elements that are used in the project.

The application provides modeling and diagram authoring features which allow you to add numerous items like interfaces, subsystems, component instances, packages and classes among others.

It also supports add-ins which you can use to expand its functionality for various programming languages. The elements used in a project can be thoroughly customized and analyzed, plus each of them comes with editors for constraints, tagged values and collections.