Xmind - Xmind is a brainstorming and mind mapping application.
Effortless - Stay focused and beat procrastination on your Mac.
MindManager - With MindManager, flexible mind maps promote freeform thinking and quick organization of ideas, so creativity and productivity can live in harmony.
Be Focused by XWaveSoft - Simple Pomodoro timer in your Mac's menu bar
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Forest App - Forest is an app that helps you stay focused on the important things in life.