Never heard of this before. It's just a text file where you write stuff in, so... any text editor would work I presume?
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Markor
Nice! If only it had a syncing option - only possibility seems to be syncthing.
Todo.txt (the app) is the closest to an official one. Like most though, incredibly outdated looking though.
Currently trying this and it looks good to me. Also has Google Drive and Dropbox sync which is great.
Not sure if this will fit the bill, but I am a huge fan of Joplin for general note taking and to dos.