Habitica - Habitica is a free habit building and productivity application.
YourHour - YourHour is an app by Mindefy labs through which you can easily overcome with your phone addiction by monitoring your phone usage.
Do It Now - Do It Now is a great mobile app that helps you to create new habits and maintain focus on your goals.
21 Days - 21 Days app enables the user to track their habits to take challenges to adopt good habits.
myPoli - Gameified to-do list and habit tracker.
iBetter - iBetter app comes up with features to help you in fighting bad habits and developing new habits through your smartphones.