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Useful Tools For UI Designing
For wireframing, prototyping, drafting, doodling...etc. Some are physical simulation softwares that would be interesting to use in advanced interfaces such as Surface (Microsoft) or MultiTouch (same company name in Finland)
FlairBuilder is a cross-platform tool for rapid authoring of interactive wireframes and software prototypes.http://iplotz.com/
iPlotz allows you to rapidly create clickable, navigable mockups and wireframes for prototyping websites and software applications.http://www.lumzy.com/
Lumzy is a Quick MockUp tool. It's a simple to use drag n' drop app for creating quick mockups on the run with hand-drawn feel.http://www.balsamiq.com/
Balsamiq Create software mockups in minutes, Collaborate with your team, Focus on creating your product.
Chalkboard Easy and fun to use sketching tool with a chalkboard interface. Pick up chalk from the tray, press and drag on the board to draw. Line thickness and transparency are set with the controls in the lower left corner of the board.