Loop Habit Tracker - Loop Habit Tracker (AKA uhabits) helps to create and maintain good habits in order to achieve their...

Habitica - Habitica is a free habit building and productivity application.

Disciplined - Effortlessly integrate essential habits into your life

Coach.me - Coach.me is a coach that goes everywhere with you, helping you achieve any goal, change any habit, or build any expertise.

Everyday - Take a photo of yourself everyday.

haatch - Set personal ambitious goals, break them down into smaller, dopamine-friendly, actionable steps, see complex predictions including "Where you should be at", develop positive habits and witness a new, better version of yourself taking shape.