The Pencil Project is a free and opensource tool to make diagrams,layouts, sketch and GUI prototypes.
Main 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
Download Mozilla Pencil Project
