Habitica - Habitica is a free habit building and productivity application.

Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.

Coach.me - Coach.me is a coach that goes everywhere with you, helping you achieve any goal, change any habit, or build any expertise.

The ToDon't List - A to-do list for avoiding the things you shouldn't be doing

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.