I’ve been flat out with the iMoot during the last two days, and half way through now. One of the nice discoveries was XMind.
I’ve used a huge number of mind mapping tools over the years, with Mindomo and Freemind (free for Mac, Windows and Linux) being my favourites, although there’s at least a dozen other popular options (MindMeister seems popular with secondary school teachers). XMind seems to be one of the easiest and ‘coolest’ although the free version doesn’t have all the features of the paid version. However, the free version will certainly let you work out if it’s the right tools for you, and if it’s worth paying the small fee for the Pro version.