Pencil is a Firefox add-on to do GUI prototyping and simple sketching.
The Pencil Project's unique mission is to build a free and opensource tool for making diagrams and GUI prototyping that everyone can use. With Pencil you can create GUI prototype and sketches for Firefox.
Note: The Pencil add-on is cross-platform and it works on Mac OS X, Windows and Linux.
Here are some key features of "Pencil":
· Built-in stencils for diagraming and prototyping
· Multi-page document with background page
· On-screen text editing with rich-text supports
· PNG rasterizing
· Undo/redo supports
· Installing user-defined stencils
· Standard drawing operations: aligning, z-ordering, scaling, rotating...
· Cross-platforms
· Adding external objects
Requirements:
· Firefox 3.0b3 to 3.5.*
What's New in This Release: [ read full changelog ]
· Fix all image related issues including: pasting, embedding
· Remove dependency on pImageLoader.js
· Cleanup code in processing embedded image
· Add impl for exporting the selection to PNG
· Temp. disabled the position/dimension toolbar for debuging
· Fix rasterizing issues that depends on timeout