- A Merging of Fates [[Rom] 2.4b6 + Modified] (January 31, 2011)
- A Moment in Tyme [[Circlemud] Heavily modified, originally based on CircleMud 3.0 bpl 14] (March 8, 2007)
- M*U*S*H [[MUSH] PennMUSH] (November 16, 2000)
- MOO Canada, Eh? [[MOO] LambdaMOO] (June 18, 2000)
- MOOSE Crossing [MOOSE] (March 12, 1997)
- MOOsaico [[MOO] 1.8.1] (March 24, 2005)
- MTBS Nations at War [[Unknown]] (March 10, 2008)
- MUCK University [[MUCK] GlowMUCK 3.2.1] (March 15, 2011)
- MUD Valinor [[Smaug] (Heavily modified)] (November 22, 2008)
- MUD2 [[Custom] MUD2] (August 3, 2000)
- MUDII [[Custom]] (December 10, 2007)
- MULTI MUD! [[Circlemud] CircleMUD 3.0bpl8, highly modified] (August 8, 2012)
- MUME - Multi Users In Middle Earth [[Dikumud] Dikumud I derived] (May 26, 2009)
- MUSHMellow [MOO] (April 26, 1997)
- Macross: New Horizon [[MUSH] PennMUSH] (March 2, 2012)
- MaddockMUX [[MUX] [MUX]] (February 8, 2004)
- Maiden Desmodus [[Custom]] (June 30, 2010)
- MajorMUD [[Custom] ODS BBS Running a FREE MajorMUD v1.11p] (July 6, 2012)
- Malacious Bliss [[Rot] DRM/SD] (September 24, 2011)
- Malevolence [[LP] Heavily modified H7] (July 8, 2007)
- Mario MUSH [[MUSH] ] (October 6, 2012)
- Marvel MUCK - Heroes of New York [[MUCK] Proto Muck] (July 21, 2009)
- Marvel Revolution [[MUCK] Heavily modified] (February 21, 2009)
- Marvel Untold [[MUX] MUX 2.7.4.29] (August 12, 2011)
- Marvel: City of Lights [[MUSH] TinyMUSH] (August 2, 2012)
- Marvel: The Rift [[MUX] 2.9] (August 4, 2010)
- Masquerade [[MUX] TinyMUX] (May 9, 2011)
- Mass Effect: Alpha & Omega [[MOO] ] (May 14, 2013)
- Match Of The Millennium [[MUCK]] (October 17, 2010)
- Materia Magica [[Custom] IEN (Interactive Entertainment)] (January 26, 2013)
- MatrixMUD [[Circlemud] LexiMUD] (August 31, 2008)
- Meadow [[MOO] ] (April 25, 2012)
- Meadows MUCK [[MUCK] GlowMUCK] (February 13, 2012)
- MediaMOO [MOO] (May 28, 2010)
- Medieval Theatre [[LP]] (April 18, 2002)
- Medieval Times MUD [[Circlemud] [Circlemud heavily modified with an SQL backend]] (May 18, 2009)
- Medievia [[Custom] Custom] (July 22, 2006)
- Medina [[Merc] ] (October 8, 2012)
- Mega Man Mush [[MUSH] PennMUSH version 1.8.3 patchlevel 9 [02/28/2008]] (June 9, 2009)
- Mercator [[Circlemud] ] (November 26, 2012)
- Merentha [[LP] Merentha/NM MM-2.03] (May 17, 2003)
- Metro: Toronto By Night [[MUSH] ] (May 4, 2013)
- Metropolis Universalis [[MUCK] ProtoMuck] (March 31, 2011)
- MicroMUSE [[MUSE] TinyMUSE v1.7b4.0.0 beta] (January 23, 2006)
- Midian [[LP]] (January 7, 2006)
- Midkemia Online [[Custom] ] (January 30, 2013)
- Midnight Sun 2 [[LP] ] (December 18, 2011)
- Might and Magic [[Silly] Diku/Silly/MnM 2.06] (October 12, 2011)
- Minerva [[LP] Dead Souls 3.6] (March 3, 2012)
- Minstrel Hall [[Custom]] (August 17, 2010)
- Miriani [[MOO] Heavily modified LambdaMOO] (November 17, 2007)
- Mirkwood [[Rom] Heavily Modified] (August 1, 2011)
- Mirrors of the Wheel [[Circlemud] Heavily modified] (May 5, 2012)
- Moomellow [[MOO]] (October 8, 2003)
- Moral Decay [[LP]] (January 2, 2008)
- Mordor [[Merc] DIKU/MERC/MORDOR 11.0] (January 24, 2013)
- MorgenGrauen [[LP] LDMud-3.5.0] (February 10, 2013)
- Mortal Realms [[Merc] Extremely customized] (June 25, 2003)
- Mozart MUD [[Silly] +18 years of development] (October 18, 2011)
- Mud Dweller [[Unknown] Worldgroup v3.20NT v1.1g + mods] (October 28, 2001)
- Mud of Chance [[Dikumud]] (October 14, 2002)
- Muddy Waters [LPmud (CD)] (March 24, 1999)
- Multi MUD [[Custom] Inspired by CircleMUD] (July 16, 2006)
- Multi-User Dungeon (British Legends) [[Custom] Ported from the BCPL original] (December 23, 2000)
- Multiverse Crisis MUSH [[MUSH] PennMUSH] (February 11, 2012)
- Murderous Intent [[GodWars] Godwars Deluxe/2k6] (May 17, 2013)
- My Little Pony: Roleplaying is Magic [[Unknown] PennMush] (January 19, 2013)
- MyristicaMUCK [[MUCK] ProtoMUCK] (August 16, 2011)
- Myrradel [[Envy] Heavily, heavily, heavily modified UltraEnvy mud.] (December 22, 2003)
- Mystery Mud [[Rom] Modified] (September 30, 2011)
- Mystic [[LP] Heavily Modified] (July 1, 2004)
- Mystic Adventure [[Merc] Merc 2.2 base heavily modified] (July 21, 2006)
- Mystical Mud [[Circlemud] Heavily Modified CircleMud] (September 13, 2009)
- The Mage's Lair [[Dikumud] DIKU Derivative. Extensively modified.] (April 13, 2010)
- The Minds Eye [[Rom] Heavily Modified] (July 28, 2009)
- The Ministry [[MUSH] TinyMUSH version 3.0] (March 24, 2001)
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