UML - Tools & Utilities
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StarUML - StarUML is an open source project to develop fast, flexible, extensible, featureful, and freely-available UML/MDA platform running on Win32 platform.
ArgoUML - ArgoUML is the leading open source UML modeling tool and includes support for all standard UML diagrams.
Umbrello UML Modeller - Umbrello UML Modeller is a Unified Modelling Language diagram programme for KDE.
Acceleo - Acceleo is easy to use. It provides off the shelf generators (JEE, .Net, Php...) and template editors for Eclipse.
UML Tools List @ Wiki - Comprehensive list of UML Tools and Utilities.
GenMyModel - An online UML modeling tool