Taskwarrior is a free and open-source command-line task manager that is designed to help users organize and manage their to-do lists and other tasks.

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Org-mode is a super-powerful Emacs plugin to manage outlines using a plain text storage format. Items can be associated to timestamps, priorities, labels, and many other metadata, and they can be shown grouped by time (agenda), tags, etc.

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todo.txt is a minimalistic todo manager that uses a simple plain text file to keep track of items; implemented as a shell script.

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