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Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
MyLifeOrganized - MyLifeOrganized: The Most Flexible Task Management Tool.
Remember The Milk - Remember The Milk is a task and time management application for mobile devices.
TickTick - TickTickis a cross-platform to-do list app & task manager helps you to get all things done and make life well organized.
Microsoft To-Do - Task management tool
Things - Things is an easy to use task manager.