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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!
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Geary - Geary is an email application built for GNOME 3.
Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.
Evolution - Apps/Evolution - GNOME Wiki!
Strikethru - Strikethru is a kind of to-do list notebook for managing work lists and staying updated with the important tasks.