Plan - Plan is a better way to organize.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Realworld - A comprehensive platform to make adulting easier
TaskPaper - Plain text to-do lists for Mac
Purp - A smart to-do list and goal tracker app
TickTick - TickTickis a cross-platform to-do list app & task manager helps you to get all things done and make life well organized.