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Gone - An ephemeral to-do list
productboard - Beautiful and powerful product management.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Hassl - A really great project management app
Check - Check is a unit testing framework for C, which runs on environments such as GNU/Linux, GNU/Hurd, BSD, and Mac OSX.
Arbor - Easily manage product development