- DB: Sphere of Fantasy [[Smaug] DBNAv1.7.6(Heavily Modified)] (October 9, 2017)
- DBZ: A New Dawn [[MUSH] ] (April 8, 2015)
- DBZ: Edge of Chaos [[Smaug] DBTLS v3.0] (June 6, 2016)
- DC Alternate Earth [[MUX] ] (June 20, 2015)
- DCU: Legacies of Justice [[MUSH] PennMUSH] (February 24, 2007)
- DREAMPIECE [[Rom] Rom 2.4b, modified.] (February 27, 2016)
- 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)
- Dark Castle [[Dikumud] Completely redeveloped by the DC Code Team.] (April 25, 2010)
- 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]] (December 10, 2014)
- Dark Metal [[MUSH] Rhost] (October 13, 2012)
- Dark Mists [[Rom] Heavily Modified Rom 2.4g] (June 25, 2014)
- Dark Realms: City of Syne [[Custom] ] (May 6, 2015)
- Dark Risings [[Rom] Rom 2.4 (modified)] (February 22, 2018)
- Dark Skies [[GodWars] dystopia[HIGHLY MODIFIED]] (November 24, 2016)
- Dark Spires Mush [[MUX] ] (July 7, 2013)
- Dark Wizardry [[Envy] heavily modified envy] (August 6, 2014)
- Dark and Shattered Lands (DSL) [[Rom] Custom, still has Rom2.4 sections of code] (October 10, 2013)
- 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] (December 5, 2017)
- Darker Realms [[LP] LPMud with custom modifications] (April 13, 2006)
- Darklord 2.0 - The Blood of Time [[GodWars] Heavily Modified, godwars/soh/mindcloud] (September 3, 2016)
- Darklord MUD by Mogwai [[Circlemud] Medium Modifications] (August 13, 2017)
- Darkness and Despair [[LP] Nightmare 3.2/DnD] (April 13, 2012)
- 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 [[Dawn] ] (January 20, 2016)
- Dawn of Demise [[Smaug] Derived from SMAUG 1.4] (September 17, 2015)
- Dawn of the Ages [[Dikumud]] (September 14, 2006)
- Days of Dragons [[Smaug] Modified] (October 30, 2017)
- De Digitale Metro [[MOO]] (December 29, 2001)
- Dead Souls [[LP] Dead Souls lib] (July 8, 2008)
- Dead of Night [[Dikumud] Heavily Modified] (May 23, 2017)
- Death Rising: Rebirth [[Rot] Modified Rot. Running DRM Codebase] (August 23, 2015)
- Deathmatch MOO [[MOO] modifyed gammaMOO] (December 30, 2014)
- Deathwish MUD [[Circlemud] ] (January 8, 2018)
- Deckeon [[Rom] Gutted and Modified Shadowrun style.] (January 10, 2008)
- Deep Shadows [[Unknown] Evennia] (September 2, 2015)
- Deeper Trouble [[LP] LDMud 3.3.720] (March 20, 2011)
- Defender of Dragons [[Smaug] Modified to allow grouping with dragons. In testing right now, but playable.] (September 19, 2017)
- Delphine [[LP] LDMud] (June 29, 2004)
- 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] Modificado] (July 7, 2016)
- Devil's Silence [[Rot] Heavily Modified RoT] (May 22, 2016)
- DiscordiaMUSH [TinyMUSH] (July 30, 1997)
- Discworld [[LP] Discworld LP] (July 30, 2013)
- Distant Lands [[Circlemud] Completely customized since 1994.] (January 25, 2008)
- Distant Travels [[MUCK] Proto] (October 28, 2016)
- 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)
- DoomMud [[TBA] ] (November 24, 2015)
- Dragon Age MUSH [[MUSH] PennMUSH] (January 23, 2016)
- Dragon Age: Smoke and Shadows [[MUSH] ] (May 20, 2016)
- Dragon Ball - The Dark Prince Returns [[Circlemud] ] (April 12, 2018)
- Dragon Ball Star [[Smaug] ] (August 10, 2017)
- Dragon Ball: Age of Destruction [[Smaug] ] (December 2, 2015)
- Dragon Swords [[Merc] 14 years of modifications] (October 31, 2012)
- Dragon's Den [[Custom] LPMud (MudOS)/Dragon mudlib] (July 10, 2017)
- Dragon's Exodus [[EOS] DE, hugely re-written yet based upon EoS2] (October 7, 2015)
- DragonBall Evolution [[Circlemud] DBX modified for 15+ years] (April 12, 2018)
- DragonBall Z FE [[Custom] ] (August 5, 2014)
- DragonBall: Infinity [[Smaug] Heavily Modified] (September 10, 2013)
- DragonBall: The New World [[Smaug] Modified] (June 7, 2016)
- DragonBall: Tournament [[Custom] Based on Trenton's Dragon Ball: FE(Fighters Edition).] (March 26, 2018)
- DragonKnigth [[Custom] WebBased] (October 15, 2004)
- DragonMud [TinyMud] (October 22, 1996)
- DragonRealms [[Custom]] (October 1, 2002)
- Dragonball - Infusion [[Circlemud] DBT1.8 Modified] (April 29, 2016)
- Dragonball Advent Truth [[Circlemud] DBAT v2.3] (June 21, 2013)
- Dragonball Arena [[Rom] 2.4 (Heavily Customized)] (March 19, 2018)
- Dragonball Intergalactic Warriors [[Smaug] HEAVILY MODIFIED, CUSTOMIZED] (February 26, 2018)
- Dragonball New Universe: Hopes Beginning [[Smaug] Dbsaga, Dbr, dbna2, dbnu.1.9.5] (December 29, 2017)
- Dragonball Uprising [[Smaug] CFP+DBS derivative] (July 31, 2017)
- Dragonball X: Journey to Power [[Circlemud] ] (September 24, 2015)
- Dragonball: Alternate Realities [[SWR] DBSWR] (April 16, 2014)
- Dragonball: North Star [[Smaug] 2.4] (September 12, 2017)
- Dragonballz Universe [[Smaug] ] (March 3, 2018)
- Dragonfire II [[LP] Custom 2.4.5] (February 12, 2001)
- Dragons Domain IV [[Envy] Very heavily modified Envy codebase.] (May 28, 2017)
- Dragons' Star [[Circlemud] Heavily Modified Circle 3.0] (May 19, 2003)
- Dream Chasers [[MUSH] ] (February 15, 2017)
- DreamScapes 2 MUD [[Circlemud] heavily modified] (April 21, 2012)
- Dreams [[Envy] Modified] (June 23, 2012)
- Dreamverse [[LP] Modified Nightmare IV] (February 20, 2014)
- Drugwars [[Rom] ] (January 22, 2016)
- Dune [[LP] LP-Mud] (January 10, 2005)
- Dungeonia [[CoffeeMud] ] (July 28, 2015)
- Duris: Land of BloodLust [[Dikumud] 99% rewrite of Gamma Diku] (August 27, 2014)
- DustMARE [[Unknown]] (March 6, 2011)
- DynamixMUSH [[MUSH] PennMUSH] (July 23, 2010)
- Dystopia MUX [[MUSH] ] (August 29, 2016)
- The Darkening Sun [[Dawn] DSv4] (October 21, 2015)
- The Dragonverse [[Merc] Diku] (February 25, 2015)
- d20MUD : Star Wars ( d20 / SAGA MUD ) [[Circlemud] Uses Star Wars SAGA Edition d20 Rules] (February 17, 2018)
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