Everyday - Take a photo of yourself everyday.
Habit List - Create good habits and break bad ones with the app that keeps you focused.
Habit - Habit is a habit tracker application that allows users to keep track of the habits all day long and throughout the year.
HabitCoach - Habits to follow from the best life-changing books.
Habitify - The easiest way to keep track of your habits
Habitica - Habitica is a free habit building and productivity application.