ProductiveApp.io - Productive is a habit tracking application.
Gone - An ephemeral to-do list
Streaks - The to-do list that helps you form good habits.
Strides - Track all your goals & habits in one place, with flexible reminders to hold yourself...
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Habit List - Create good habits and break bad ones with the app that keeps you focused.