If you are interested in the broad range of vi clones that have existed (and still exist) over the decades, one of the better resources on the subject was published by Sven Guckes:

https://guckes.net/vi/clones.html

I hope that someone takes up the mantle here, because M. Guckes collected more information than the O'Reilly book had, and there's more to be had from the decade since.

#nvi #elvis #stevie #calvin #vi #vim #neovim #winvi #Watcom #ex #nex #view #nview #BillJoy #BramMoolenaar #KeithBostic #SvenGuckes