Habitica - Habitica is a free habit building and productivity application.
Loop Habit Tracker - Loop Habit Tracker (AKA uhabits) helps to create and maintain good habits in order to achieve their...
LifeRPG - Automatically prioritize your goals and gain XP for achieving them. Features:
Flow Dashboard - Habit, task & goal tracking + quantified self
Coach.me - Coach.me is a coach that goes everywhere with you, helping you achieve any goal, change any habit, or build any expertise.
Google Calendar - Spend less time managing your day & more time enjoying it