Habitica - Habitica is a free habit building and productivity application.
Nirow - Habit tracking: Automated, Siri-ed, Calendar-ed, and More!
Loop Habit Tracker - Loop Habit Tracker (AKA uhabits) helps to create and maintain good habits in order to achieve their...
Gone - An ephemeral to-do list
Flow Dashboard - Habit, task & goal tracking + quantified self
Taskful - Deadlines, meet your match.