[billfruit]

ed, emacs.

[Isamu]

I was going to say emacs too.

GNU emacs goes back to 1985, although I used TECO emacs before that.

But ed is older, although what is in use today is probably GNU ed, which was written after GNU emacs.

[beatgammit]

Do you actually use Ed, or the series of other programs that are based on it, like vi(m) and sed?

[billfruit]

I occasionally try to use ed as a distraction free editor.