Streaks - The to-do list that helps you form good habits.
Habit List - Create good habits and break bad ones with the app that keeps you focused.
Way of Life - Habit tracking on iOS
Momentum - Agile goal and performance management
Habitica - Habitica is a free habit building and productivity application.
everyday.app - Every day, it gets a little easier. But you gotta do it every day, that's the hard part.