rootninja

yEd Graph Editor

http://www.yworks.com/en/products_yed_about.html

Get rid of Microsoft Visio once and for all. I love that I can run this anywhere as long as I have the run-time environment available. You can output your charts in many formats even as Flash.

http://www.yworks.com/products/yed/features/yworks-products-flash.html

yEd is a powerful diagram editor that can be used to quickly and effectively generate high-quality drawings of diagrams.
Create your diagrams manually or import your external data for analysis and auto-magically arrange even large data sets by just pressing a button.