Pencil is a standalone app or Firefox extension that lets you create diagrams or UI mockups. It doesn't have collaboration/multi-user features.
The Pencil Projects unique mission is to build a free and opensource tool for making diagrams and GUI prototyping that everyone can use.
Top features:
Built-in stencils for diagraming and prototyping
Multi-page document with background page
Inter-page linkings!
On-screen text editing with rich-text supports
Exporting to HTML, PNG, Openoffice.org document, Word document and PDF.
Undo/redo supports
Installing user-defined stencils and templates
Standard drawing operations: aligning, z-ordering, scaling, rotating...
Cross-platforms
Adding external objects
Personal Collection
Clipart Browser
And much more...
Pencil can be installed as Firefox extension or as a standalone application for Windows, GNU/Linux and MacOS X
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