- Bad Trip [[Rom] Heavily modified ROM 2.4] (May 24, 2012)
- Bajor3D [[MUCK] FuzzBall MUCK server with 3D extensions] (September 25, 2001)
- Bakhara [[LP] Lima-1.0a5 (sorta)] (May 16, 2002)
- Balderdash [[Rom] Very strong modifier by Russian Coders.] (August 7, 2004)
- Balzhur [[Smaug] Smaug 1.4a modified] (February 23, 2007)
- Banished Lands [[Custom]] (January 20, 2001)
- Barren Realms [[Merc] merc2.2 heavily modified] (November 17, 2006)
- BatMUD [[LP] Customized LPC driver.] (April 25, 2006)
- Battletech 3060 [[MUX] BattleTech MUX 0.7.0-rc4+HUD+HAG+ALG RELEASE svn revision 1334 'Fly' build #14] (March 26, 2010)
- Battletech: The Frontier Lands [[MUX] Realtime Battletech Extensions (BTMux)] (May 9, 2006)
- BayMOO [[MOO]] (November 24, 2002)
- Beauty [[MUSH] TinyMUSH3.x] (June 27, 2001)
- Bedlam [[Circlemud] Based on AnotherWorld 2.x] (April 11, 2013)
- Beleriand [[MUSH] PennMUSH] (November 14, 2007)
- Between Shadows and Light [[Rom] Clan PvP MOD] (February 24, 2012)
- Beutelland [[Custom] RoleMUD] (April 18, 2004)
- Beyond the Veil of Shadows [[Rom] 2.4 [Heavily Modified]] (March 30, 2004)
- Big Damn MUSH :: Be a Hero [[MUSH] CobraMUSH/PennMUSH derivative] (March 13, 2008)
- Black Sands MUD [[Unknown] Modified Project Argila 1.0] (January 4, 2013)
- BlackMUD [[Silly] Derived Diku/Silly] (November 18, 2001)
- Bleached InuYasha Galaxy [[Smaug] SmaugFUSS, modified] (July 4, 2009)
- Blood Dusk [[Circlemud] Heavily modified] (March 2, 2005)
- Blood Fire Death [[LP] Skylib1.8] (September 10, 2011)
- Blood of Dragons: A Song of Ice and Fire MUSH [[MUSH] PennMUSH] (November 14, 2012)
- BrMUD [[TBA] Traduzido, Altamente Modificado e Customizado] (September 5, 2011)
- Brigadoon [[Rom] 2.4 beta] (December 2, 2008)
- BrutusMUD [[Circlemud] Started as CircleMUD but has been completely rewritten from scratch] (November 27, 2008)
- Buffy Mud [[Custom]] (February 10, 2010)
- Burning [[Dikumud] Heavily modified since 1988] (August 6, 2010)
- Burning Skies MUSH [[MUSH] ] (October 3, 2011)
- By Right of Blood [[MUX] TinyMUX] (February 26, 2013)
- The Builder Academy [[TBA] tbaMUD (codebase formerly known as CircleMUD)] (September 5, 2012)
- The Burbs [[Unknown] EwToo/summink] (March 16, 2002)
- The Burning Eye [[Rom] Heavily Modified [Burn1.7]] (October 19, 2012)
- The Burning Post II [[Rom] Heavily Modified] (August 11, 2012)
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