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
Collaboration
- TiddlyWiki http://tiddlywiki.com
- EtherPad http://openetherpad.org
- SyncPad http://mysyncpad.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
Color Theory & Practice
- ColorBrewer find colors for your visualizations (Flash)
- tristen.ca/hcl-picker like ColorBrewer, no Flash (D3/Chroma.js)
- TinyColor quick color manipulation in JS