chitchat - Chat Room with Selfies and Pagers (yes, pagers!)
Xmind - Xmind is a brainstorming and mind mapping application.
Chalk - Chalk is a calculator that tries to do right what others do wrong.
MindManager - With MindManager, flexible mind maps promote freeform thinking and quick organization of ideas, so creativity and productivity can live in harmony.
Twist - Check fewer notifications, do more meaningful work. Twist is the team communication app for calmer, more organized, and more productive teamwork.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.