- Iberia MUD [[Custom] Iberia MUD Engine (Custom, Java)] (January 2, 2013)
- Icesus [[LP] Icelib] (April 8, 2009)
- IcewindMUD [[LP] MudOS] (August 18, 2004)
- Iconoclast [[Circlemud] Circle 3.0 (Highly Customized)] (January 23, 2008)
- IgorMud [[LP] DGD] (February 26, 2006)
- Illusia: Quest for the Eternals [Custom/Graphical] (August 24, 1997)
- Illusions of the Mind [[Rom] Rom 2.4] (January 12, 2013)
- Imperial v3.5 [[Dikumud] Highly modified Diku] (November 4, 2003)
- Imperian: The Sundered Heavens [[Custom] ] (January 30, 2013)
- Imperium [[Dikumud] Diku (Modified)] (October 23, 2011)
- In Nomine: R&D [[MUX]] (April 4, 2009)
- Indeterminate Destiny [[Rot] ] (May 30, 2013)
- InfernoMOO [[MOO] Modified with hellcore.] (February 12, 2013)
- Infinite Planes [[Circlemud] Heavily modified Circle] (January 16, 2003)
- Insidious Awakening II - Rebirth [[GodWars] IA 1.2/BotI] (May 12, 2012)
- Insomniacs Asylum [[Rom] ROM Version 2.4 beta w/many modifications] (March 6, 2011)
- Insymnia - New [[Circlemud] Heavily Modified ] (March 5, 2012)
- Intrepid [[Circlemud] ] (May 10, 2013)
- Ironclaw Online [[Unknown]] (January 29, 2007)
- Isengard [[Mordor] Mordor 6.99m8] (May 18, 2005)
- Islands of Myth [[LP] Started from lima 1.0b3] (March 15, 2009)
- Isles of Aedin [[Custom]] (October 23, 2010)
- Ivalice [[Rom] IV:C] (February 14, 2012)
- The Inquisition by Murghen [[Rom] The Inquisition code base by Robert and Tamara] (November 10, 2011)
- The Inquisition: Atonement [[Rom] Unrecognizable] (October 21, 2011)
- The Inquisition: Legacy [[Rom] Customized beyond recognition] (December 11, 2012)
- The Isles: Dreams of Kltara [[NiMUD] Build 12773] (August 10, 2010)
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