Thankbot - Drive more business with handwritten notes
Xmind - Xmind is a brainstorming and mind mapping application.
Thankster - Automagically send hand written cards
MindManager - With MindManager, flexible mind maps promote freeform thinking and quick organization of ideas, so creativity and productivity can live in harmony.
Socialkeeper - Cultivate your friendships
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.