Unified Modeling Language Tools

1 Desktop UML Tools

Most desktop UML analysis and design tools are fairly expensive. However, there are some free tools available and some student/limited editions of commercial products as well, including:

Dia
UMLet
Visual Paradigm for UML (Community Edition)

2 Online UML Tools

There are some simple and easy UML tools available on the WWW, including:

Gliffy
Visual Paradigm Online
yUML