- SMiLE [[Aber] Heavily modified iDiRT derivation] (April 7, 2003)
- STAR WARS: Age of Alliances Ep7-8 MUSH [[MUSH] ] (April 23, 2018)
- STAR WARS: Unsung Heroes [[MUSH]] (February 25, 2008)
- Sanity's Edge [[LP]] (January 25, 2007)
- Sayari Mud [[CoffeeMud] Slightly Modified Server] (September 7, 2017)
- Scarlet [[Unknown] Talked based on nuts333, now heavily modified.] (July 5, 2006)
- SchMOOze University [MOO] (December 08, 1996)
- Scions of Meridian [[Custom]] (December 7, 2001)
- Seattle 2064 [[Circlemud] AwakeMud v0.84, modified] (March 2, 2018)
- Second Contract [[LP] modified Dead Souls mudlib] (October 11, 2014)
- Second Pass MUSH [[MUSH] TinyMUSH 3.0] (June 26, 2011)
- Seltami [[AFKMud] Please see the homepage for playing information.] (April 26, 2018)
- Sentience [[Rom] Extensive modification and additions; no stock areas] (September 23, 2016)
- Serenity : The Firefly MUSH [[MUSH] HSpace Trueline 4.3.11 with PennMUSH 1.8.1 Patch 5] (June 23, 2008)
- SerenityMUSH [[MUSH] PennMUSH] (April 20, 2018)
- Seven Spindles MUX [[MUX] MUX 2.4.0.22 #2] (March 31, 2013)
- Shades [Custom] (April 20, 1997)
- Shadow Siege [[Circlemud] Draig] (August 28, 2004)
- ShadowGate [[LP] ShadowGate 1.5] (June 5, 2005)
- ShadowGate MUD [[LP] Nightmare lib, heavily rewritten] (May 22, 2017)
- ShadowGate Re-Imagined [[Unknown] Latest Fluffos Driver, heavily modified Nightmare Lib. ] (February 13, 2017)
- ShadowHunter [[Custom] runs from browser] (August 15, 2000)
- ShadowMUD [[LP] ] (October 2, 2016)
- Shadowrun - Denver [[MUSH] TinyMUSH 3.0 Patchlevel 4 #167] (May 9, 2004)
- Shadowrun Germany [[MUSH] none] (July 1, 2001)
- Shadows of Isildur: Laketown RPI [[Dikumud] RPI Engine/ARPI Engine Derived] (November 7, 2015)
- Shadows of the underworld [[GodWars] Ethereal Mist derivitave] (June 6, 2016)
- Shangrila [[MUX] ] (August 13, 2011)
- Shattered Isles [[CoffeeMud] Modified w/ S.I. Engine v4.0] (September 5, 2016)
- Shattered Kingdoms [[Rom] Heavily modified] (March 30, 2013)
- Shattered Realms [[Rom] VILE Codebase] (March 18, 2018)
- Shattered World [[LP] http://swlpc.sourceforge.net] (March 22, 2004)
- Sheltering Sky: Colorado by Night [[MUSH] Pennmush: 1.8.3] (September 11, 2014)
- SheolMOO [[MOO] HellCore] (July 9, 2017)
- Shoujo-Ai MUSH [[MUSH] PennMUSH] (February 27, 2014)
- ShyeMUSH [[MUSH] TinyMUSH 3.0] (February 28, 2002)
- SidaliciaMUD [[Circlemud] highly modified Circle3(bpl14)] (January 10, 2002)
- SilberLand [[LP] minor patches applied to 3.2.1@141] (December 10, 2001)
- Silmaril [[Envy] EnvyIT] (March 21, 2002)
- Silmarillia MUD [[Envy] ] (January 31, 2012)
- Simauria [[LP] [MudLib Sim 1.6.0.1]] (May 26, 2008)
- Sindome [[MOO] ANSI XML FILE-IO WEB-IO] (June 7, 2017)
- SleeperMUD [[Circlemud] Modified version of awake MUD] (July 12, 2014)
- Slice and Dice Dungeon [[Custom] ] (March 16, 2018)
- SlothMUD [[Dikumud] Heavily Modified] (January 27, 2013)
- SluggyMARE [[MUSE] MARE (modified system)] (April 2, 2004)
- SnapMUD [[Rom] Modified GhostMUD] (May 17, 2015)
- Sneezy of Grimhaven [[Dikumud] Entirely rewritten code base] (April 3, 2014)
- SneezyMUD [[Dikumud] Heavily-modified. Converted to C++/Database structure.] (December 17, 2017)
- Sociopolitical Ramifications [[MUCK] Muck2.2fb7.00a3(5)] (June 14, 2017)
- Solar Eclipse [[Rom] Heavily modified] (November 11, 2014)
- Sonic the Hedgehog: New Horizons [[Unknown] ProtoMUCK-Cygwin 2.0b7.07 (Muck2.2fb6.01)] (April 11, 2008)
- Spellbound MUX [[MUX] ] (May 18, 2012)
- Spindizzy [[MUCK] TinyMuck 2.2 Fuzzball 5.64] (March 27, 2000)
- Splintered Realms [[Rom] (modified- LOD 3.1)] (September 6, 2010)
- Split Infinity [[LP] Heavily Modified] (July 15, 2007)
- Stained Death Mayhem [[Rot] Paradox (Modified)] (January 31, 2014)
- Star Conquest [[MOO] ] (August 20, 2012)
- Star Dart Alpha [[Unknown] Derived from the Star Dart codebase by Fred Haslam] (February 19, 2002)
- Star Trek: Faded Glory [[MUSH] PennMUSH 1.8.5p4] (November 4, 2013)
- Star Trek: Phoenix Rising [[MOO] Purpose built space system, with some core mods.] (February 17, 2018)
- Star Wars - Return of the Sith - Reborn [[SWR] Modified] (February 21, 2018)
- Star Wars Edge of Destiny [[MUSH] RhostMUSH Alpha version 3.9.3(A) #1] (March 27, 2013)
- Star Wars Galactic Dominion [[SWR] Heavily Modified] (March 10, 2013)
- Star Wars MUSH [[MUSH] Chargen/Skills/Languages/VOS Hardcode] (September 25, 2001)
- Star Wars Mud (SWmud) [[LP] SWmud lib based on Nightmare] (November 2, 2017)
- Star Wars: Dawn of Defiance [[MUSH] RhostMUSH] (February 5, 2016)
- Star Wars: Eternal Conflict [[SWR] Modified SWRFUSS] (August 21, 2014)
- Star Wars: Fate of The Republic [[SWR] RitS 3.0] (April 8, 2012)
- Star Wars: Generations [[MUSH] PennMUSH] (November 4, 2012)
- Star Wars: Generations of Darkness [[MUSH] RhostMUSH Alpha v3.9.4RL(A).p2] (February 28, 2016)
- Star Wars: Imperial Awakening MUSH [[MUSH] TinyMUSH 3.0] (April 16, 2011)
- Star Wars: Jedi vs Sith [[SWR] Greatly Modified (SW:JvS v1.4.0)] (May 30, 2016)
- Star Wars: Knights of Darkness [[SWR] SWKoD (Alpha)] (July 19, 2015)
- Star Wars: Legacy [[SWR] (Modified AotE (FotE 2.1.5))] (July 2, 2010)
- Star Wars: Legacy of the Sith [[Smaug] SWR] (May 15, 2014)
- Star Wars: Omens [[MUSH] ] (December 21, 2016)
- Star Wars: Revenge of the Jedi [[Circlemud] Circle - Heavily Modified] (February 13, 2009)
- Star Wars: Synthesis [[SWR] FotE-FUSS 1.4 (Modified)] (April 10, 2014)
- Star Wars: The Old Republic MUX [[MUX] ] (July 8, 2016)
- Star Wars: Uprising [[MUSH] PennMUSH 1.8.4p0] (September 18, 2016)
- Star Wars: Way Of The Force [[LP] DGD 1.2.148 heavily modified, lpmud/kobramud derived lib] (August 18, 2008)
- StarMUD [[LP] Custom (MudOS 22.2b13, StarLib 4.0b)] (November 19, 2002)
- Stardust and Lightblades [[Dikumud] Heavy Mods] (July 6, 2016)
- Starlane: The Arcturus Game [[Custom] Requires custom Java client] (March 17, 2000)
- Static Chaos - Still Alive [[Merc] Modified Merc Codebase] (January 18, 2013)
- Stick in the MUD [[Rom] ROM 2.3] (July 16, 2000)
- StickMUD [[LP] LDMUD] (July 25, 2016)
- Stillborn [[MOO] HellCore] (September 27, 2017)
- Stonia (The Cruel and Lost World of Stonia) [[Dikumud] Bases on Diku, ROM 2.3; about 70-80% recodings, 90% new areas] (January 4, 2009)
- StormHunters [[Ack!mud] (de-ack!ed)] (February 18, 2015)
- StrangeMUD [Circle 2.2] (January 26, 1999)
- Strife in the Age of Steam [[MUSH] FS3 softcode] (January 15, 2014)
- StuphMUD [[Circlemud] StuphOS Core Extension, ZifOLC] (May 1, 2012)
- Summertime [[Smaug] ] (December 10, 2017)
- SumuMud [[LP] MudOS] (March 19, 2001)
- Survivors [[Custom] This is a WAP MUD, you can play it using your WAP enabled mobile phone] (December 10, 2000)
- Swords of Chaos [[Custom] Modified heavily to accommodate large user base ] (June 17, 2017)
- Synergy [[LP] CD Lib] (December 7, 2004)
- The Savage Soul [[LP] Dead Souls] (June 5, 2012)
- The Sea of Storms [[Smaug] Very heavily modified] (March 17, 2007)
- The Seven Kingdoms [[CoffeeMud] ] (April 16, 2014)
- The Shadow's Embrace [[Rom] Heavily Modified] (May 1, 2013)
- The Soul Ruins [[ResortMUD] 4.0b (highly modified)] (November 5, 2009)
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