Pencil Project is a unique tool for developers that turns Firefox 3 in to a rapid sketching and GUI Prototyping utility with native Windows and Linux GTK widgets.

Install the addon and open a new document to start prototyping. It supports common shapes like Text, rich text, Images, Rectangles etc and Annotation shapes like arrows, bullets, GTK widgets and Windows XP widgets. Using Pencil is easy just drag and drop the shapes or widgets you want to add to the application and customize them with text and colors etc. The finished prototypes can be exported to PNG images. 

Since it is Firefox 3 extension it works in all environments which supports Firefox 3, if you wish a standalone version you can get it for Linux and Windows Xp / Vista.

Download Pencil Project Firefox 3 addon, Related: Check out Useful Firefox Extension for Developers.

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