Streaks - The to-do list that helps you form good habits.
Plan - Plan is a better way to organize.
Taskful - Deadlines, meet your match.
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.
Clean Google Calendar - Makes Google Calendar look nicer & launches as a desktop app