- NYC: Veil of Shadows [[MUSH] PennMUSH] (April 30, 2012)
- NannyMUD [[LP] Very extended LPMud] (July 20, 2012)
- Nanvaent [[LP] Driver: NANVAENT 3 (MudOS v22.2b14)] (April 3, 2007)
- Narnia MUCK [[MUCK] Muck2.2fb5.68 -- GlowMuck 3.2.1Alpha4] (April 19, 2012)
- Naruto Mush: Rivalry [[MUSH]] (July 1, 2008)
- NarutoMUD [[Smaug] Modified SmaugFUSS, NarutoMUD (Engine)] (May 29, 2010)
- NaughtyMuffin MUSH [[MUSH] PennMUSH 1.8.5p1] (June 20, 2012)
- NeXus [[GodWars] Godward Deluxe + Dreams of Demise] (January 8, 2013)
- Nebbie Arcane [[Dikumud] AlarMUD (modified diku mud)] (October 23, 2002)
- Necromium [[Circlemud] Circle/Diku] (April 14, 2004)
- Neronis [[Rom] ROM 2.4b6] (July 4, 2009)
- NetherWorld [[Dikumud] Merc Diku 2.2] (May 20, 2009)
- New Bourn Kaos [[GodWars] Dystopia 2] (December 11, 2011)
- New Draconia Muck [[MUCK] Fuzzball] (January 11, 2004)
- New Eden Mud [[Circlemud] Heavily Extended] (November 5, 2011)
- New Moon [[LP] LPMud] (November 3, 2001)
- New Orleans by Night [[MUSH] PennMUSH, modified] (April 16, 2013)
- New Worlds [[Custom] LP Mud] (January 14, 2011)
- NewHopeMUSH [[MUSH] PennMUSH] (February 26, 2013)
- Nexus of Realities MUX [[MUX] TinyMUX] (May 31, 2012)
- Night War Paradox [[Rot] rot paradox pkp slightly modified] (November 8, 2011)
- Nightfall [[LP] ] (March 19, 2012)
- Nightmist [[Custom]] (March 23, 2001)
- Nilgiri, the Forgotten World [[Custom] Originally DikuMUD Sequent code base] (September 27, 2012)
- Nirvana [[LP] LP 3.1.02-DR] (March 29, 2013)
- No Reality [[Rom]] (January 29, 2009)
- Nodeka [[Custom] Custom] (June 11, 2004)
- Noir Haven MUCK [[MUCK] ProtoMUCK] (December 13, 2012)
- Northern Crossroads [[Dikumud] 20 years-modification] (July 23, 2012)
- Northern Lights [[Aber] AberMUD 4 - NL-dirt (based on DIRT 3.0)] (October 23, 2004)
- Northern Vampire Mysteries [[MUX] ] (February 15, 2012)
- Nuclear War [[LP] Heavy modification] (June 1, 2012)
- neoNecronomicon [[Unknown] Original code running on a Mac OSX] (November 10, 2002)
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