UMLet - UML Tool for Fast UML Diagrams
The free UML tool UMLet lets you draw UML diagrams with a light-weight, pop-up-free user interface. It lets you draw diagram sketches fast; export diagrams to pdf, eps, jpg, gif...
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WireframeSketcher Wireframing Tool
WireframeSketcher is a rapid wireframing tool that helps quickly create wireframes, mockups and prototypes for desktop, web and mobile applications.