- DB: Sphere of Fantasy [[Smaug] DBNA(Heavily Modified)] (September 1, 2012)
- DBZ/Bleach: Worlds Collide [[Smaug] DBZU codebase being heavily modified.] (May 7, 2012)
- DBZ: EoC [[Smaug] ] (May 22, 2012)
- DCU: Legacies of Justice [[MUSH] PennMUSH] (February 24, 2007)
- DS Wonderland [[Unknown] Written in Python] (September 27, 2011)
- DUMII [[DUM] DUMII] (October 13, 2011)
- Dalines By Night [[MUSH] TinyMUSH 3.0, Java browser front end.] (December 20, 2001)
- Darbonne, the Floating City [[Mordor] Hosted by Styx, an original and early DM] (November 8, 2001)
- Dark Castle [[Dikumud] Completely redeveloped by the DC Code Team.] (April 25, 2010)
- Dark Forces MUSH [[MUSH]] (March 22, 2011)
- Dark Gift [[MUSH] TinyMUSH 3.0 pl4] (October 28, 2004)
- Dark Isles [[Circlemud] Oasis Version, heavily modified] (October 31, 2012)
- Dark Lair [[GodWars] [Modified Dark City]] (February 2, 2009)
- Dark Metal [[MUSH] Rhost] (October 13, 2012)
- Dark Mists [[Rom] Heavily Modified Rom 2.4g] (September 10, 2012)
- Dark Rifts [[Unknown] SCB (1.0.700111) derived from TMI-2] (April 10, 2013)
- Dark Risings [[Rom] Rom 2.4 (heavily modified VAMPIRE mud)] (May 25, 2012)
- Dark Skies [[GodWars] dystopia[HIGHLY MODIFIED]] (April 9, 2010)
- Dark Spires Mush [[MUX] ] (February 17, 2013)
- Dark Wizardry [[Envy] heavily modified envy] (January 19, 2011)
- Dark and Shattered Lands (DSL) [[Rom] Custom, still has Rom2.4 sections of code] (August 6, 2012)
- Dark-Legacy MUD (Dark Legacy MUD) [[Smaug] Modified] (June 29, 2010)
- DarkBlade [[MUCK] NMC 1.22 + mods] (May 29, 2002)
- DarkWind [[LP] Heavily Modified] (June 25, 2003)
- DarkeMud [[LP] the Darkelib] (October 2, 2012)
- Darker Realms [[LP] LPMud with custom modifications] (April 13, 2006)
- Darkness and Despair [[LP] Nightmare 3.2/DnD] (April 13, 2012)
- Darkon Mud [[Circlemud] D20MUD V-0.90] (March 21, 2013)
- Darkover [[Circlemud] DIKU/Circle v2.2 (97% rewritten to Custom)] (January 15, 2010)
- Darren Reid's The Half Broken Crown: The Broken Kingdoms [[Custom]] (June 14, 2007)
- Dartmud [[LP] LP Mud 3.1.2] (November 8, 1999)
- Dawn [[LP] modified discworld] (December 9, 2007)
- Dawn Mud [[LP] modified discworld] (February 27, 2007)
- Dawn of Demise [[Smaug] Derived from SMAUG 1.4] (July 26, 2005)
- Dawn of the Ages [[Dikumud]] (September 14, 2006)
- Dawning Age of Cybertron [[MUSH] ] (May 3, 2012)
- De Digitale Metro [[MOO]] (December 29, 2001)
- Dead Souls [[LP] Dead Souls lib] (July 8, 2008)
- Dead of Night [[Dikumud] Heavily customized] (January 18, 2006)
- Dead of Night LPMud [[LP] Amylaar LPMud] (February 17, 2002)
- Death's domain [[Dikumud] Heavily Modified,True Multi-Class with Subguild Classes; 70% unique areas] (May 30, 2011)
- Deckeon [[Rom] Gutted and Modified Shadowrun style.] (January 10, 2008)
- Deeper Trouble [[LP] LDMud 3.3.720] (March 20, 2011)
- DeimosMUD [[Circlemud]] (November 25, 2007)
- Delphine [[LP] LDMud] (June 29, 2004)
- Delusion [[Aber] VME] (August 23, 2001)
- DelusionsMUCK [[MUCK] TinyMUCK (Fuzzball)] (June 16, 2001)
- Desolation [[LP] Lima Mudlib, version 1.0a8 (LPMud)] (September 10, 2000)
- Devil's Bob MUD (DeBo MUD) (Brasil) [[Circlemud]] (August 23, 2009)
- Devil's Silence [[Rot] Heavily Modified RoT] (April 20, 2012)
- Devil's Silence II: Battle for Blood [[Rot] ] (July 8, 2011)
- Dibrova II [[Circlemud] Heavily Modified] (January 3, 2010)
- Discordia [[MUCK] Protomuck] (March 4, 2013)
- DiscordiaMUSH [TinyMUSH] (July 30, 1997)
- Discworld [[LP] Discworld LP] (December 16, 2003)
- Distant Lands [[Circlemud] Completely customized since 1994.] (January 25, 2008)
- Divided Sky [[LP] Skylib 1.8] (September 5, 2005)
- Divine Blood [[Rom] Rom24b6[Modified]] (December 5, 2008)
- Dizzymud [[Rom] Rom 2.4 Base 5 years of modifications] (November 10, 2003)
- Dominia MUD [[Circlemud] heavily customised] (January 18, 2010)
- Draconia MUD [[Smaug] Strongly modified] (September 12, 2009)
- Dragon Ball Arena [[Rom] Rom 2.4, Derived from DikuMUD] (September 30, 2011)
- Dragon Ball Nexus of Dimensions [[Smaug] Heavily modified Saga 2.5] (May 18, 2011)
- Dragon Ball Star [[Smaug] 1.4a (Modified almost beyond recognition)] (September 10, 2008)
- Dragon Realm [[LP] Heavily modified version of Nightmare mudlib running on FluffOS (now with MySQL support!)] (January 11, 2012)
- Dragon Swords [[Merc] 14 years of modifications] (October 31, 2012)
- Dragon's Den [[Custom] LPMud (MudOS)/Dragon mudlib] (January 4, 2013)
- Dragon's Exodus [[EOS] EOSII HIghly Modified] (June 5, 2012)
- DragonBall Evolution [[Circlemud] DBE] (May 25, 2012)
- DragonBall Xtreme [[Rom] Rom 2.4, Derived from DikuMUD] (September 30, 2011)
- DragonBall Z Epic [[Custom] ] (January 22, 2013)
- DragonBall: Infinity [[Smaug] Heavily Modified] (June 17, 2009)
- DragonKnigth [[Custom] WebBased] (October 15, 2004)
- DragonMud [TinyMud] (October 22, 1996)
- DragonRealms [[Custom]] (October 1, 2002)
- Dragonball - Nexus [[Circlemud] Modified DBT] (May 17, 2013)
- Dragonball Advent Truth [[Circlemud] CWG Rasputin 3.5.31 (Heavily Modified)] (December 3, 2011)
- Dragonball New Universe: Hopes Beginning [[Smaug] Dbsaga, Dbr, dbna2, dbnu.1.9.5] (January 8, 2013)
- Dragonball Uprising [[Smaug] CFP+DBS derivative] (April 1, 2013)
- Dragonball Z Legends [[Smaug] DBNA [Heavily Modified]] (May 15, 2013)
- Dragonball Z World: Vintage [[Smaug] Heavily modified] (July 24, 2012)
- Dragonball Z: Intergalactic Wars [[Smaug] Heavily Modified] (May 6, 2013)
- Dragonball: Resurrection of Truth [[Circlemud] DBT Created by Iovan] (March 14, 2013)
- Dragonball: The Forsaken Future [[Smaug] DBTFF v1.1 ALPHA(DBNA 1.7(Heavilly Modified)] (June 12, 2012)
- Dragonfire II [[LP] Custom 2.4.5] (February 12, 2001)
- Dragonheart MUD [[LP] ] (October 15, 2011)
- Dragons' Star [[Circlemud] Heavily Modified Circle 3.0] (May 19, 2003)
- Dragonstone Mud [[Dikumud] ] (September 12, 2012)
- Dream Land [[Rom] ROM+ANATOLIA+DREAMLAND] (January 11, 2009)
- DreamScapes 2 MUD [[Circlemud] heavily modified] (April 21, 2012)
- Dreams [[Envy] Modified] (June 23, 2012)
- Drugwars 2013 [[Rom] ROM 2.4 moded huge] (April 19, 2013)
- Dune [[LP] LP-Mud] (January 10, 2005)
- Dungeon Runners [[Rom] Most stock] (May 15, 2004)
- Duris: Land of BloodLust [[Dikumud] 99% rewrite of Gamma Diku] (April 17, 2012)
- Duskwood [[Rom] Heavy Coded (almost new engine) v.1.6] (November 5, 2010)
- DustMARE [[Unknown]] (March 6, 2011)
- DynamixMUSH [[MUSH] PennMUSH] (July 23, 2010)
- The Dark Tower RomMud [[Rom] Rom 2.4b6 Moderately Modified] (February 8, 2008)
- The Darkening Sun [[Dawn] 10 years of enhancements to parent source] (April 13, 2011)
- The Dragonball (Lost Time) [[Smaug] Heavily modified] (March 22, 2011)
- d20MUD: Forgotten Realms [[Circlemud] d20MUD Fantasy Version] (April 12, 2013)
- d20MUD: Star Wars [[Circlemud] Uses Star Wars SAGA Edition d20 Rules] (April 17, 2013)
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