Xmind - Xmind is a brainstorming and mind mapping application.
Better Notes - Simple notes app that ties notes together with #hashtags
MindManager - With MindManager, flexible mind maps promote freeform thinking and quick organization of ideas, so creativity and productivity can live in harmony.
Whimsical - The visual workspace for teams.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Great F*cking Startup Advice - Strongly worded suggestions for startup founders