<ul>
<li><a href="https://taskwarrior.org/">taskwarrior.org</a>
<ul>
<li>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.</li>
</ul></li>
</ul>
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<ul>
<li><a href="https://timewarrior.net/">timewarrior.net</a>
<ul>
<li>Timewarrior is Free and Open Source Software that tracks time from the command line.</li>
</ul></li>
</ul>
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<ul>
<li><a href="https://medium.com/@jrisch/tracking-time-with-taskwarrior-and-timewarrior-6759f3542276">Article on the Medium website</a>
<ul>
<li><em>Tracking time on the command line with Taskwarrior and Timewarrior</em></li>
</ul></li>
</ul>