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Resources: Concept and Design Tools
- Balsamiq Mockups http://builds.balsamiq.com/b/mockups-web-demo/
- Mockingbird https://gomockingbird.com/mockingbird/
Brainstorming
- Mindmeister http://www.mindmeister.com
User Interface and graphics prototyping
- MIT/Google App Inventor http://appinventor.mit.edu/
- Glade for Python http://glade.gnome.org/
- Live HTML5 coding http://htmlivecode.com/
- jsFiddle http://jsfiddle.net