MUD

Argentum Online

1999 · Windows

BatMUD

1990 · Linux, Windows +2

GemStone IV

1988 · Browser, Linux +2

Simutronics

AVATAR MUD

1991

Achaea, Dreams of Divine Lands

1997 · Browser, Linux +3

Iron Realms Entertainment

Ancient Anguish

1992 · cross-platform

DikuMUD

1990 · Legacy Computer

Discworld MUD

1991 · Linux, MS-DOS +3

Diversity University

1993 · cross-platform

Dragon's Gate

1990 · cross-platform

Elendor

1991 · cross-platform

FurryMUCK

1990 · Windows, cross-platform

LambdaMOO

1990 · cross-platform

Pavel Curtis

Lost Souls (online game)

1990 · Android, Linux +4

MicroMUSE

1990 · cross-platform

MorgenGrauen

1992 · cross-platform

Shadow of Yserbius

1991 · MS-DOS