Streaks - The to-do list that helps you form good habits.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
ToDoList - Windows desktop application to stay on top of your daily tasks.
Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.
Things - Things is an easy to use task manager.
Purp - A smart to-do list and goal tracker app