Xmind - Xmind is a brainstorming and mind mapping application.

Precursor - Precursor helps designers and developers communicate and collaborate in real time.

MindManager - With MindManager, flexible mind maps promote freeform thinking and quick organization of ideas, so creativity and productivity can live in harmony.

mi.team - Collaboration app with chat, task board & video conference

MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.

Justinmind - Define awesome experiences through wireframes & prototypes.