Flow Dashboard - Habit, task & goal tracking + quantified self
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.
Everyday - Take a photo of yourself everyday.
LifeRPG - Automatically prioritize your goals and gain XP for achieving them. Features:
everyday.app - Every day, it gets a little easier. But you gotta do it every day, that's the hard part.