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Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Geary - Geary is an email application built for GNOME 3.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Evolution - Apps/Evolution - GNOME Wiki!
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.