Todoman
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The iCalendar format also supports saving tasks in form of
"VTODO"-entries, with the same file extension as normal events:
".ics". Many CalDAV servers support synchronizing tasks, vdirsyncer
does too.

todoman is a CLI task manager supporting vdir. Its interface is
similar to the ones of Taskwarrior or the todo.txt CLI app. You can
use "filesystem" with it.
