The Free On-line Dictionary of Computing (30 December 2018):

MicroGnuEmacs

    (mg) A Public Domain Emacs-style editor
   modified from MicroEmacs to be more compatible with GNU
   Emacs.  mg is essentially free, it is not associated with the
   GNU project, and does not have the GNU copyright restrictions.
   It is a small, fast, portable editor for people who can't run
   real Emacs thing for one reason or another.  It has few if any
   of the MicroEmacs features that were incompatible with GNU
   Emacs and adds missing features that seemed essential.

   MicroGnuEmacs is derived from, and aims to replace, v30 of
   MicroEmacs, the latest version from the original MicroEmacs
   author Dave Conroy.  The chief contributors were Mike Meyer
   , Mic Kaczmarczik
   , Bob Larson, and Dave Brower
   .

   mg version 1a of 1986-11-16 works with 4.2BSD, 4.3BSD,
   Ultrix-32, OS9/68k, VMS, Amiga, System V, Eunice.
   It is included in base OpenBSD. It should also support
   MS-DOS, PC-DOS and the Rainbow.

   (http://www.isc.org/index.pl?/sources/editors).

   (2007-05-25)