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Re:Ask HN: The most useful Mac keyboard shortcuts? by gknoy on Tuesday August 06, 2019 @03:23AM (#20622955)
I forget what the tool was, but I recall someone mentioning they mapped CapsLock to ESC when tapped, and to Ctrl when held.
Re:Ask HN: The most useful Mac keyboard shortcuts? by brookter on Tuesday August 06, 2019 @05:20AM (#20623592)
It's Karabiner Elements on the Mac.

On Linux you can get it to do the same thing with a combination of xmodmap, setxkbmap and xcape (but it's fiddly) and on Windows with AutoHotkey (but it's fiddly) — neither are as easy to use as Karabiner Elements, but they do work.