An UML 2 tool that provides advanced code generation, reverse engineering, and round-tripping functionality with support for the Java programming language. [Commercial, 30-day Trial]

Offers tools that supports the UML notation on Macintosh, Windows, and Linux. Capabilities includes system analysis, requirements traceability, and software design. [Commercial]

UML2 modeling tool for Windows, Linux and Mac OS X, supporting code generation and reverse engineering. [Free Software, GPL]

Requirements analysis and project definition tool for both business and technical users. [Commercial, Free trial]

Cross-platform and easy-to-use visual UML modeling and CASE tool. Round-trip code generation and code reverse engineering support for Java. Integrated with Eclipse, JBuilder, NetBeans, IDEA, JDeveloper and WebLogic Workshop. [Commercial, Free Trial]

Allows companies to define and implement their own modeling languages and code generators, model analysis and documentation reports. Runs under Windows, Linux and Mac OS X [Commercial, Free Trial]

Extensions for Visual Studio, Eclipse, WebSphere, JBuilder, NetBeans, IDEA, JDeveloper and WebLogic Workshop that support editing UML 2.0 diagrams, Java code and documentation generation. [Commercial, Free Community Edition]

A list of UML case tools and reviews, by Michael W. Godfrey.

UMLGraph allows the declarative specification and drawing of UML class and sequence diagrams. [Open Source]

A lightweight tool for rapidly drawing UML diagrams from within the Eclipse environment. [Open Source, GPL]