Coach.me - Coach.me is a coach that goes everywhere with you, helping you achieve any goal, change any habit, or build any expertise.
Taskful - Deadlines, meet your match.
Strides Habit Tracker - Track all your Habits and Goals in this free and flexible application.
Streaks - The to-do list that helps you form good habits.
HabitBull - HabitBull
ToDoBook - Turn your Facebook (& other social media) News feed into a to-do-list.