What are some alternatives?
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
XMind - XMind is a brainstorming and mind mapping application.
FreeMind - FreeMind is a premier free mind-mapping software written in Java.
MindManager - With MindManager, flexible mind maps promote freeform thinking and quick organization of ideas, so creativity and productivity can live in harmony.
TheBrain - TheBrain: The Ultimate Digital Memory
FeatureMap - FeatureMap story mapping, simple and effective realtime collaboration and collective intelligence tool.