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Xmind - Xmind is a brainstorming and mind mapping application.
Mailbutler - Mailbutler adds lacking functionality to email clients and increases your productivity
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
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Coggle - Coggle is a simple, beautiful, powerful way of structuring information.