Xmind - Xmind is a brainstorming and mind mapping application.
Apple - Available on iOS
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
iPad 9.7" - The new $329 entry-level iPad for students
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.
Microsoft Surface - Life is a passion project.