[fladd]

Nice, but (like most tools) misses the crucial feature of start (or scheduled) dates.

I think of one the best plain text implementations of a todo system is the one that is a bit hidden in the task plugin that comes with Zim Wiki [0]. It has start and due dates, nested tasks, priority flags, keywords (which can function as GTD states for instance) and tags.

  [ ] An example task with a @tag
    [ ] A subtask with start AND due date >2022-04-02 <2022-04-09
    [x] A prioritized subtask !
    [x] An subtask with higher priority !!
  NEXT Another task defined by a keyword

[0] https://zim-wiki.org