The Pencil Project's 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
* Object snapping
* Sketchy Stencil
* And much more...