Micro habits: Self-Improvement app - Super charge your self-improvement journey with Micro habits
Habit List - Create good habits and break bad ones with the app that keeps you focused.
HabitCoach - Habits to follow from the best life-changing books.
Streaks - The to-do list that helps you form good habits.
Habitify - The easiest way to keep track of your habits
ProductiveApp.io - Productive is a habit tracking application.