CircleMUD is a multi-user dungeon game system (MUD) written by Jeremy Elson, originally at
Johns Hopkins University's Department of Computer Science (I graduated in May of 1996).
CircleMUD is a derivative of DikuMUD Gamma 0.0, which was written in 1990 at DIKU, the
Department of Computer Science at the University of Copenhagen, by Katja Nyboe, Tom
Madsen, Hans Henrik Staerfeldt, Michael Seifert, and Sebastian Hammer.