Actually someone just reverted that reference.
https://en.wikipedia.org/w/index.php?title=Taskwarrior&diff=...
I've been looking for something like this for a very long time. Anyone know of something like this with a GUI?
Not sure it qualifies as "something like this", but for Linux/GTK, GTG [1] comes to mind.
[1] https://en.wikipedia.org/wiki/Taskwarrior