Taskwarrior
Manage your TODO list from the command line
Screenshots

Hunter's comment
Everyone likes and often makes TODO lists, and is usually often web-based, Taskwarrior uses a different approach and may also target different users, developers who spend time in the terminal and command line.
Taskwarrior is Free and Open Source Software that manages your TODO list from the command line. It is flexible, fast, and unobtrusive. It does its job then gets out of your way.(Source)
Another advantage of Taskwarrior is open source and has more than 351 tools/extensions that can be used. Have a look at https://taskwarrior.org/tools/.
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