Author: John Powers ?
Download: ftp://ftp.process.com/vms-freeware/fileserv/ked.zip (TPU source)
It is a predecessor of the famous EDT editor. I believe it originated the use of the keypad in the manner now famous in EDT.
It is the standard editor on DEC RT-11 operating system.
I believe KED was replaced on either Vax/VMS or RSTS-E or RSX-11m+
On the VAX, RSTS-E, and RSX-11m+ boxes I once worked on, EDT was supplied, with TECO also available. I don't recall KED in the mix. --DMcCunney
The Download link points to a source archive for KED, written in TPU. This appears to be a descendant of the original. --DMcCunney