Xmind Is A Great Rapid Mind-Mapper And Diagram Tool
I have used a ton of different mind-mapping, flow-charting and graphing applications on Windows, Linux and Mac OS X and they all have specific positives and negatives. The ones that are the most complex also tend to be the slowest to rapidly diagram with but have the most features to really enable complex rendering.
Xmind (http://www.xmind.net) [...]