Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Tasrix - Manage your tasks and monitor your productivity
Doneit - Meet Doneit, a feature-packed projects and tasks manager that focuses on simplicity and organization.
Taskwall - Remote teams and Individuals use Taskwall to stay organized with their projects, tasks, and team in a powerful application that adapts to the individual needs.
Things - Things is an easy to use task manager.
Motion Firefox - All-in-one time management tool in Firefox