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Umlet - great and open source tool to create uml diagrams

UMLet is an open-source UML tool with a simple user interface: draw UML diagrams fast, export diagrams to eps, pdf, jpg, svg, and clipboard, share diagrams using Eclipse, and create new, custom UML elements.
umlet.com

As umlet is writen in java, it runs on every java platform like linux, solaris, windows and mac osx. The interface is self explaning, try it out.