- A Reflection of the Wheel [[Circlemud] Reflections, v 2.2] (September 14, 2010)
- RIFTs: Rise From Chaos [[MUSH] TinyMUSH 3.0] (October 15, 2002)
- RPG Basement [[Custom] n/a] (July 10, 2000)
- Raccoon Muck [[MUCK] Fuzzball] (February 13, 2000)
- Rage of Vengeance [[Smaug] Ragemud (99% modified SMAUG)] (May 22, 2009)
- Ragnarok [[LP]] (June 14, 2010)
- RanmaMUCK [[MUCK] TinyMUCK fb5.66] (February 27, 2001)
- Rauvyon [[Dikumud] SOD. Fully multi threaded.] (June 21, 2006)
- RavenMUD [[Circlemud] Circle 3.0bpl11] (September 27, 2009)
- Razor's Edge [[Circlemud] Modified Circle base, with clans, remorts, new spells and skills, many original zones, e] (August 29, 2011)
- Reality Bytes [[Smaug] heavily modified] (May 4, 2013)
- Realm of Magic [[Circlemud] Massively Modified] (January 28, 2012)
- Realm of Shadows [[Smaug] Heavily Modified Smaug] (October 14, 2009)
- Realm of Utopian Dreams [[Rom] uniquely and heavily modified] (November 9, 2010)
- Realms Eternal [[Rom] Modified Rom2.4b6] (May 29, 2011)
- Realms of Chaos [[LP] ChaosLib 1.0/Nightmare 3.2] (January 30, 2005)
- Realms of Corl [[MUSH] [MUSH]] (November 2, 2004)
- Realms of Despair [[Smaug] Development Site for SMAUG] (January 30, 2008)
- Realms of Redemption [[LP] Modified Discworld] (November 4, 2010)
- Realms of the Dragon [[LP] LP] (August 19, 2010)
- Realmsmud [[LP] LDMud 3.2.9-Dev.489] (April 2, 2011)
- Reanimation [[Rom] Highly Modified] (December 22, 2012)
- Red Tide MUX [[MUX]] (February 29, 2008)
- Redemption [[Rom] Significantly modified Rom 2.4] (May 17, 2010)
- Redwall [[MUCK] Nameless MUCK Code 1.21] (October 28, 2012)
- Reinos De Leyenda - Los años oscuros [[LP] LPmud version: FluffOS v2.22-RL // Mudlib version: Pusa-v2.1] (December 5, 2011)
- Rek-Mud 4: The Four Kingdoms [[GodWars] Heavily Modified] (August 23, 2012)
- Renegade Outpost 5 [[Silly] Heavily Modified over 15 years] (March 22, 2008)
- Retaliation [[GodWars] ] (February 9, 2012)
- RetroMUD [[LP]] (February 15, 2010)
- Return of the Shadow [[Circlemud] Circle (heavily modified) -- smooth transition into C++ original code is planned] (August 19, 2007)
- Revelation [[Custom] Server uses a custom protocol and own client, NOT telnet.] (March 27, 2008)
- Revelations [[MUX] 2.10.1.11] (October 14, 2012)
- Rifts: Chronicles of Kingsdale [[MUSH] Tinymush 3.0b19 #1] (October 3, 2012)
- Rillaspora [[Custom] n/a] (May 9, 2004)
- Ring of Power [[Unknown] PerlMUD, severly modified] (August 3, 2011)
- Rise of Warriors [[Custom]] (February 28, 2011)
- RivaMUSH [[MUSH] RhostMUSH] (July 5, 2005)
- River of Flame [[Merc] Insanely Modified] (July 29, 2012)
- Road to Amber [[MUSH] TinyMUSH 3] (October 26, 2009)
- Rocca d'Argento [[Smaug] - v3.0] (February 2, 2009)
- RoninMUD [[Dikumud] Modified Diku Gamma] (December 31, 2012)
- Round Table 3 [[LP] LPMUD 3.1.1 - DR] (February 9, 2001)
- RubbeRoom [[LP] Heavy Modifications!] (December 20, 2007)
- Rupert [[MOO]] (July 13, 2001)
- Rusted Promises [[MUCK] ProtoMUCK] (November 29, 2012)
- Ryksyll MOO [[MOO] 1.8.1] (March 2, 2004)
- The Reach [[MUX] ] (September 27, 2011)
- The Realms of Hell [[Mordor] RoH] (January 27, 2012)
- The Resort Online [[Unknown] EW] (September 8, 2000)
- The Rock Bottom - Miami by Night [[MUX] Memory Based, WODRealms] (February 5, 2012)
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