Gone - An ephemeral to-do list
Calendarist - Time blocking companion for Google Calendar
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.
Centered - Centered helps you get into a Flow State faster and stay there longer so you can do your best work.
Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.