MagicDraw is a visual UML modeling and CASE tool with teamwork support. Designed for Business Analysts, Software Analysts, Programmers, QA Engineers, and Documentation Writers, this dynamic and versatile development tool facilitates analysis and design of Object Oriented (OO) systems and databases. It provides the industry's best code engineering mechanism (with full round-trip support for J2EE, C#, C++, CORBA IDL programming languages, .NET, XML Schema, WSDL), as well as database schema modeling, DDL generation and reverse engineering facilities.

Nb. 90 day trial period - but you need to register to download and get a keyfile for the Demo. The Demo is limits the number of: classes, actions, use cases, states, instances, lifelines, nodes and components. But there is an option to get "an unlimited evaluation version key" if you contact magicdraw at the specified email-address.