Kingfisher - Organize and explain just about anything.
Xmind - Xmind is a brainstorming and mind mapping application.
Explained Visually - An experiment in making hard ideas intuitive.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Crowdcast - CrowdCast provides webinars & virtual conferences.
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.