Pencil: GUI prototyping

Pencil is built for the purpose of providing a free and open-source GUI prototyping tool that people can easily install and use to create mockups in popular desktop platforms (Linux, Max OSX, Windows). Pencil is a good free Microsoft Visio alternative. Easy GUI Prototyping Built-in Shape Collections Diagram Drawing Support Exporting to Different Output Formats
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yEd Graph Editor

yEd is a powerful desktop application that can be used to quickly and effectively generate high-quality diagrams. Create diagrams manually, or import your external data for analysis. yEd is freely available and runs on all major platforms. yEd is a pure Java Swing application. It runs on all Windows, Unix/Linux, and Mac OS versions where
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