- AVATAR Mud [[Dikumud] Diku/Merc with over 16 years of modifications!] (February 23, 2013)
- Aabahran: The Forsaken Lands [[Dikumud] -ROM 2.4, Heavily Customized Forsaken Lands 3.0] (April 26, 2009)
- Aadaria [[Rot] Rom 2.4 and Rot 1.4] (May 24, 2013)
- Aadaria. [[Rot] Rot 1.4 & Rom 2.4] (April 14, 2013)
- Aaezure Odyssey [[Circlemud] Circle/Custom] (September 11, 2012)
- Aarchon [[Rom] Contains ARC 1.0 code] (May 13, 2013)
- Aardwolf [[Custom]] (January 14, 2009)
- Abandoned Codex [[Smaug] modified] (January 22, 2009)
- Abandoned Reality [[Merc]] (April 10, 2009)
- Abandoned Realms [[Rom] Modified heavily for fairness, and for added depth.] (July 7, 2009)
- Abattoir [[Smaug] Smaug] (February 18, 2011)
- Aber-Phoenix [[Aber]] (July 28, 2010)
- Abysmal Realms [[Rom] Heavily Customized, many enhanced features!] (April 26, 2013)
- Accursed Lands [[LP] Heavily Modified] (November 10, 2012)
- Achaea, Dreams of Divine Lands [[Custom] ] (January 31, 2013)
- Acid Rain [[MOO] hellcore v0.9.6] (March 26, 2013)
- Acropolis [[Rom] Highly modified ROM] (December 30, 2012)
- Act of War [[Rom] ] (March 27, 2013)
- Act of War: the Last Stand [[Rom] ] (May 9, 2013)
- AddictMUD [[Circlemud] 3.0] (March 8, 2009)
- AderonMUD [[Circlemud] ] (September 10, 2012)
- Adventures Unlimited [[Rom] 2.4b6(pretty darn good)] (August 2, 2012)
- Aesir [[GodWars] Modified LOW4] (May 10, 2013)
- Aesir 2 [[Dikumud] ROM 2.3/Merc 2.1 Mix] (July 28, 2009)
- Aethar II [[Smaug] Heavily Modified, Supports Java] (October 26, 2011)
- Aetolia, the Midnight Age [[Custom] ] (January 30, 2013)
- After Hours [[LP] LDmud] (April 21, 2004)
- After the Plague [[LP] MudOS (CoreDump mudlib)] (January 30, 2006)
- AfterFive [[MUSH] TinyMUSH 2.2.1 #21, 2.2.2 [DaemonMUCH 0.15 enhanced, Pueblo 1.X enhanced]] (May 12, 2000)
- Age Of Dragons [[Circlemud] ] (April 23, 2012)
- Age of Chaos [[Circlemud] Chaos Code, originally Circle 2.2] (February 16, 2005)
- Age of Heroes 2 [[GodWars] Dystopia 1.4] (May 12, 2013)
- Age of Humanity [[Circlemud] OLC+additional building cmd's, scripts, triggers, autoquest, crafting and much much more] (May 23, 2013)
- Age of Illusion [[Rom] Heavily modified] (March 10, 2013)
- Age of Legends: Tales of the Lance [[Circlemud] Heavily Modified Circle] (September 24, 2011)
- Age of War [[Circlemud] CircleMUD 3.0 - extremely modified] (February 16, 2011)
- Age of the Ancients [[Smaug] Wolfpaw] (June 19, 2005)
- Ages of Despair [[LP] MudOS driver on a modified TMI-2 mudlib] (September 30, 2003)
- Ages of Glory [[Custom]] (July 4, 2004)
- Akanbar [[Custom]] (January 28, 2013)
- Akarian Dawn: Shadows of an Empire [[MUSH] PennMUSH 1.7.2 pl 26 (with custom mods)] (March 4, 2003)
- Akashat [[MUX] MUX 2.6.3.23 #1] (April 7, 2008)
- Aladon MUD [[Rom] ROM 2.4 modified] (March 16, 2002)
- Alatia [[LP] LPmud] (May 20, 2002)
- Aldebaran [[LP] own lib] (January 4, 2009)
- AlexMUD [[Dikumud] Diku Gamma 0.0 (Heavily Modified)] (July 12, 2000)
- Alienation [[Custom] -classified-] (August 23, 2001)
- Aliens vs. Predator [[Circlemud] LexiMUD] (August 8, 2009)
- Almaren [Diku/HnS 1.0] (October 8, 1998)
- Alter Aeon [[Custom] DentinMud 2.20] (April 20, 2012)
- Altered Realities [[MUCK] Fuzzball] (December 13, 1999)
- Altered Reality [[Rom] significantly rewritten] (May 22, 2003)
- Amitoune [[Smaug] 1.4a HEAVILY modified] (November 1, 2009)
- Anaea [[Rot] Largely customized] (June 6, 2011)
- Anarres II [[Custom] MudOS A2-0.99.x series experimental LP driver] (January 16, 2002)
- Ancient Anguish [[LP] LPMud 3.2.1@141 (Native Mode)] (March 18, 2009)
- Ancient Empires [[LP]] (August 27, 2007)
- Ancient Mists [[Rom] Heavily Modified] (April 12, 2012)
- AnderLand [[LP] NATIVE mode, driver version 03.02.1@137] (October 5, 2000)
- Angalon [[LP] Based on CDlib (Chalmers Dataforeningen)] (May 18, 2011)
- Angelic Layer MUSH [[MUSH] PennMUSH 1.8.3p10 (Slightly Modified)] (October 26, 2009)
- Anime Planet [[Rot] Anime Planet [Heavily Modified Rot1.4]] (March 22, 2012)
- Animud [[Rom] Heavily Modified] (November 12, 2011)
- Anodyne [[Dikumud] SQ 0.63] (December 3, 2010)
- Ansalon [[Rom] 2.4 (from Ahotasu's AlphaMud)] (May 22, 2011)
- AnsibleMOO [[MOO] LambdaMOO 1.8.1+foo3.3beta1] (April 28, 2012)
- Aperture Science MUX [[MUX] TinyMUX 2.10 ALPHA] (April 29, 2012)
- Apocalypse [[Aber] iDiRT derivation] (August 15, 2004)
- Aragond: The Chronicles [[Rom] (Extremely heavily modified QuickMUD)] (October 14, 2010)
- Arantha - The Realms of Valor [[Circlemud] Heavily Modified - R.O.V 3.1] (January 27, 2012)
- Arcane Ages [[Dikumud] Heavily modified] (September 14, 2009)
- Arcane Nites [[Rom] Major Modifications] (January 4, 2013)
- Archons of Avenshar [[Custom] Play through custom client required] (February 16, 2009)
- Arctic [[Dikumud] Gamma Diku (heavily modified)] (February 5, 2009)
- Arda MUD [[Smaug] heavily modified] (June 3, 2004)
- Areth [[Envy] 30% Envy, 70% Custom] (October 4, 2000)
- Arion: the Nightmare [[Rom] Extremely heavily modified since 2003] (December 9, 2009)
- Ark of the Covenant [[Rom] Heavily Modified] (February 25, 2013)
- Arkadia [[LP] CDlib] (March 24, 2011)
- Armageddon [[Dikumud]] (May 13, 2013)
- Arrant Destiny [[Envy] Envy 2.0] (September 30, 2010)
- Arthnor [[MOO] MOO 1.8.1 (slightly modified), LambdaCore based] (July 8, 2004)
- Asgard [[Rot] ] (May 21, 2012)
- Asgard's Honor [[LP] DGD v1.2p2] (April 25, 2004)
- Ashavar's Legacy [[Dikumud] Judy] (February 10, 2004)
- Ashirion: The Broken Sphere [[MUX] MUX 2.1.6.28 #85 [BETA]] (June 8, 2004)
- Assault: High Tech War [[Ack!mud] Extensively modified, gutted and made into a new game] (August 31, 2011)
- Astaria [[LP] Astaria v3.5 (TMI-2 derived)] (November 9, 2009)
- Astral Plains [[Rom] heavilly modified rom 2.4] (March 30, 2000)
- AstroMUD [[Circlemud] Highly modified. Custom Remort quests. 200 zones with unique enemies, quests and gear] (November 28, 2012)
- Asylum [[Aber] APGS] (March 6, 2002)
- AtlantisMUX [[MUX] [MUX]] (October 2, 2005)
- Atonement RPI [[Unknown] Advanced RPI Engine] (June 01, 2011)
- Atrocity [[Aber] Aber] (April 19, 2005)
- Augmented Realities [[Custom] Infinity Engine, Completely Built from Scratch] (December 6, 2012)
- Aurealan Realms [[Circlemud] RoAMUD Code, v2.7] (September 25, 2004)
- Austin Nights: Trail of Blood [[MUX] ] (March 6, 2012)
- AustinMUD [[Dikumud] Far away branch of Diku Gamma 0.0] (January 31, 2009)
- Avalon [Avalon] (August 8, 1997)
- Avalon (German) [[LP] LDMud] (October 28, 2009)
- Avalon: The First Age [[Custom] Unlimited] (December 3, 1999)
- Avatar Mush [[MUSH] PennMUSH version 1.8.5] (February 10, 2013)
- Avatar West [[Merc] Using the AVATAR MUD Codebase] (July 25, 2001)
- Avendar: The Crucible of Legends [[Rom] Heavily Modified ROM] (June 23, 2008)
- AvisionMUD [[Circlemud] ] (May 1, 2013)
- Awakened Worlds [[Circlemud] AwakeMUD 0.8.21] (January 25, 2011)
- Aydindril 2 [[Rom] Rom 2.4b, heavily modified.] (April 29, 2009)
- Azereth [[Circlemud] 3.5, heavily modified] (February 21, 2009)
- The Adventurers' Inn [[Rom] Completely modified and updated] (November 27, 2012)
- The Augmented Dimension [[Circlemud] Heavily Modified/Customized] (May 3, 2012)
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