Streaks - The to-do list that helps you form good habits.
Habitica - Habitica is a free habit building and productivity application.
Taskful - Deadlines, meet your match.
Loop Habit Tracker - Loop Habit Tracker (AKA uhabits) helps to create and maintain good habits in order to achieve their...
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Purp - A smart to-do list and goal tracker app