The Pencil Project for prototyping mobile applications

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This is a cool tool. It is free and runs on Linux, Mac and Windows.
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.

Go to the Pencil Website and look for more details and download options.

Image:The Pencil Project for prototyping mobile applications