Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
BallerTODO - Ditch the list! Organize like a baller, get stuff done.
Workflowy - A better way to organize your mind.
Centered - Centered helps you get into a Flow State faster and stay there longer so you can do your best work.
Remember The Milk - Remember The Milk is a task and time management application for mobile devices.
KosmoTime - The to do list with super powers