Insightful.io
todoMini
Todoist
Remember The Milk
Google Tasks
Merge
Doit.im
Todo
Todoist 10 for iOS
jdotxt
Todo.txt
EssentialPIM
Taskade
Todoist
Trello
Taskwarrior
Simple Calendar
Mobile-friendly, minimal, private, and open-source. Works great on your phone as an add-to-homescreen web app, and there is no lock-in with pre-paid hosting.
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Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Remember The Milk - Remember The Milk is a task and time management application for mobile devices.
EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.
Google Tasks - to-do list app that integrates with Gmail and Google Calendar
Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.