Habitify - The easiest way to keep track of your habits
Habit List - Create good habits and break bad ones with the app that keeps you focused.
Momentum - Agile goal and performance management
HabitCoach - Habits to follow from the best life-changing books.
TickTick - TickTickis a cross-platform to-do list app & task manager helps you to get all things done and make life well organized.
Everyday - Take a photo of yourself everyday.