Copydue - Top writers, on-demand for as low as $150/mo
Xmind - Xmind is a brainstorming and mind mapping application.
Mailbutler - Mailbutler adds lacking functionality to email clients and increases your productivity
MindManager - With MindManager, flexible mind maps promote freeform thinking and quick organization of ideas, so creativity and productivity can live in harmony.
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MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.