Modernized, original vi
Gunnar Ritter
[email protected]
http://ex-vi.sourceforge.net
Vim
Bram Moolenaar
http://www.vim.org/
nvi
Keith Bostic
https://sites.google.com/a/bostic.com/keithbostic/nvi
elvis
Steve Kirkendall
ftp://ftp.cs.pdx.edu/pub/elvis/README.html
vile
Kevin Buettner, Tom Dickey, and Paul Fox
http://www.invisible-island.net/vile/vile.html
13.59.136.170