Cross-platform, easy-to-use UML editor integrated in the Eclipse development platform. [Open Source, GPL]

Allows editing UML, legacy diagrams and E/R and provides a round-trip database engineering tool and SQL editor in one integrated CASE tool. By Artiso Corp. [Commercial, Trial]

An application development environment supporting executable modelling, simulation and code generation. [Commercial, Free Lite Version]

Development tool for model driven architecture development according to OMG's MDA. [Commercial, Free trial]

Program to make SDL, MSC, TTCN, URN and UML2 diagrams, implemented as a Microsoft Visio add-on. [Commercial, tree trial]

A tool for creating and editing UML sequence diagrams and call flows. Supports additional elements like states, actions and timers. Exports to PDF and RTF. By Effexis Software, LLC. [Commercial, Free Trial]

Editor for UML class diagrams. [Open Source, GPL]

Telelogic TAU is a customizable modeling tool based on UML2 that supporting round-trip engineering and code generation for various languages like Java and C++. [Commercial, Trial]

Extension to Rational Rose, supports OCL: Object Constraint Language. [Commercial, free trial]

UML modeling tool which supports object-oriented software design in Java combined with Mind Map. [Commercial, Free Community Edition]