Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Plan - Plan is a better way to organize.
Focused Task - Open source mac menubar app that helps you do deep work
Drag for Gmail - Transform Gmail into organized To Do lists (like Trello)
DashCalendar - Google Calendar meets goal tracking, planning, & analytics
Tasks - The new task app from the team that brought us Wunderlist, Microsoft To-Do is a great way to manage tasks. List everything you need to do—or import tasks from Outlook, Todoist, and Wunderlist so you don't have to start over.