Pencil – Get this Extension for 🦊 Firefox (en-US)Pencil is 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
http://developer.apple.com/documentation/UserExperience/Conceptual/OSXHIGuidelines/index.html
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