Everyday - Take a photo of yourself everyday.
Habitify - The easiest way to keep track of your habits
Habit - Habit is a habit tracker application that allows users to keep track of the habits all day long and throughout the year.
Momentum - Agile goal and performance management
everydayCheck - Get disciplined with a simple but beautiful, habit tracker
Rabbit Habit Tracker - A minimalistic habit tracker with a helpful widget set