Habitica - Habitica is a free habit building and productivity application.
LifeRPG - Automatically prioritize your goals and gain XP for achieving them. Features:
myPoli - Gameified to-do list and habit tracker.
Coach.me - Coach.me is a coach that goes everywhere with you, helping you achieve any goal, change any habit, or build any expertise.
The HabitHub - The HabitHub
Hapit - Hapit is a habit tracking app that helps you take your procrastination state and convert it into actual habits.