- A Call to Arms [[MOO] LambdaMOO 1.8.1] (June 13, 2013)
- CLOK [[Custom] ] (September 20, 2012)
- COW Creative Object World [[Custom] Runs in any web browser] (February 21, 2006)
- CWG - Rasputin Beta Port [[Circlemud] [CWG-Rasputin]] (January 4, 2008)
- Cajun Nights MUSH [[MUSH] RhostMUSH Alpha version 3.9.0RL(A) patchlevel 4 #9] (December 24, 2012)
- CamelotAdventures [Unique/Java] (November 27, 1998)
- Cantr II [[Custom]] (November 19, 2001)
- Carnival of Carnage [[GodWars] 1996] (January 14, 2012)
- Carrion Fields [[Rom] Heavily Modified DikuMUD] (December 10, 2012)
- Castle Arcanum [[Envy] Envy 2.0 Heavily Modified - ARCode] (March 28, 2008)
- Castle D'Image [[MUSH] PennMUSH version 1.7.6 patchlevel 5 [01/07/2003]] (July 13, 2008)
- Castle Marrach [[Custom] DGD-based (heavily modified)] (June 3, 2012)
- CaveMUSH [[MUSH] TinyMUSH v3.1] (July 7, 2005)
- Celathryan : The Uncharted [[MUX] TinyMUX 2.0] (October 16, 2004)
- CfMud - Mud de Ciencia Ficcion [[SWR] Source heavily modified, completely original world] (October 12, 2009)
- Chalacyn Nights MUD [[Custom]] (January 6, 2006)
- Champions MUSH [[MUSH] PennMUSH] (July 21, 2012)
- Chaos Realm: Reborn [[Unknown] ] (May 30, 2011)
- Chaotic Dreams [[GodWars] Dystopia 1.2 MOD] (April 16, 2013)
- CheesyMUD [[Circlemud] CheesyMUD v3.13] (September 20, 2003)
- ChicagoMUSH [[MUSH] PennMUSH] (February 18, 2013)
- Chihuahua Mud [[Circlemud] 3.1 mostly stock with some changes] (October 23, 2003)
- Chonicles 2: The Dark Ages [[Rom] Heavily Modified] (August 30, 2011)
- Chronicles of Ice and Sky [[MUSH] ] (March 14, 2011)
- Chronicles of Ivalice: Emberstrand [[MUCK] MSSP and MCCP compatible] (January 20, 2013)
- Cities of M'Dhoria [[Rom] Highly modified ROM] (February 16, 2012)
- City of Hope MUSH [[MUX] ] (September 19, 2012)
- Clandestine [[Rom] Highly customized] (February 6, 2010)
- Clash of Worlds [[SWR] SWR] (February 18, 2010)
- Classic Discordia [[Embermud] Modified Ember Mud with max level 100.] (December 6, 2011)
- Cleft of Dimension [[Rom] 2.4 beta (Heavily Modified)] (April 16, 2013)
- Cleft of Dimensions [[Rom] Really Great!] (July 23, 2012)
- Clessidra [[Dikumud] (Now called PizzaMUD)] (May 17, 2004)
- Clout [[Custom] PHP, HTTP connection (not telnet)] (February 1, 2013)
- Coast of Seven Incarnations [[Rom] Rom 2.4b greatly modified] (January 11, 2005)
- CoffeeMud [[CoffeeMud] Home of the CoffeeMud code base!] (May 2, 2009)
- Cold Space [[MUSH] TinyMUSH version 3.1] (August 18, 2011)
- Colorado Dreams [[MUSH] pennMUSH v. 1.8.2p2] (July 13, 2007)
- Comic Adventures Mux [[MUX] ] (July 13, 2012)
- ConQUEST [[Custom] ] (July 19, 2011)
- Condemned [[GodWars] ] (April 13, 2012)
- Continents Mud [[Envy] 2.0, Rom 2.4b, plus 14 years of our own coding] (January 12, 2012)
- Core [[LP] MudOS: Colonylib] (July 12, 2008)
- Corporate Expanse: From the Cradle [[MUSH] PennMUSH 1.8.3p6] (March 28, 2009)
- Cosmic Cuttlefish [[MUSH] PennMUSH version 1.8.3 patchlevel 10] (July 8, 2012)
- Cosmic Muffin [[MUX] [MUX]] (July 9, 2011)
- Cosrin: A New Dawn [[Custom] ] (January 23, 2013)
- Cotn 2.5.4 Hybrids [[GodWars] [Dystopia 1.2.7]] (May 13, 2013)
- Covenant [[Smaug] / MUX hybrid] (February 4, 2009)
- Cowboy Bebop: Space Cowboy [[SWR] Bebop 1.0] (January 4, 2006)
- CrackWhip [[TBA] Simply point web browser to http://www.CrackWhip.com/] (March 20, 2008)
- Crimson Fate [[AFKMud] Heavily Modified] (June 1, 2009)
- Crimson MUD 2 [[Dikumud] Ubuntu Linux system] (January 31, 2011)
- Crimson Nightmares [[GodWars] Extremely Customized Gameplay] (March 22, 2006)
- Crossroads MUSH [[MUSH] PennMUSH] (December 23, 2012)
- Crusify The Chosen [[Rom] :Anatolia based.(Massively Modified)] (December 30, 2012)
- Cryosphere [[Custom] custom - musicmud] (December 8, 2010)
- Cryptal Abyss [SMAUG] (August 17, 1999)
- Crystal Mush [[MUSH]] (May 2, 2009)
- CrystalDreams [[MUSH]] (September 18, 2003)
- Cthulhumud [[Dikumud] Heavily Modified - Cthulhumud Version 9.0] (March 11, 2008)
- Cuendillar MUSH [[MUX] MUX 2.7.4.27 #1] (May 27, 2010)
- CyberASSAULT [[TBA] Extremely Modified] (April 10, 2013)
- CyberSphere [[MOO]] (April 14, 2007)
- Cyberpunk 2080: Night City Chronicles [[Rom] Heavily Modified] (May 25, 2012)
- The City of Shadows [[MUSH] ] (June 14, 2013)
- The Coming Winter [[Rom] Modified] (January 6, 2012)
- The Cortex [[Custom]] (October 9, 2009)
- The Criterion [[Silly] Some modfications to rules] (April 9, 2004)
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