- The World Called Hollow [[Custom] Perl] (December 18, 1999)
- The Worlds of Katarra [[Unknown]] (June 13, 2010)
- The Worlds of Nemesis [[Smaug] heavily modified SMAUG 1.8] (May 10, 2011)
- Wake [[Rom] heavily modified and overhauled] (September 27, 2012)
- War Dawn MUSH [[MUSH] ] (January 8, 2012)
- War of Gods [[LP] LP Mud] (October 2, 2002)
- Warhammer MUD, Wolfenburg [[Custom]] (February 19, 2001)
- Warlock [[LP] CD.04.07+MySQL, modified Genesis CDlib ver 01.00.03] (September 22, 2009)
- Warriors the Muck - Divergence [[MUCK] ] (July 28, 2011)
- Waterdeep [[Rot] 1.5b2 Heavily Modified] (March 21, 2013)
- Wayfar 1444 [[MOO] Hellcore/Wayfarcore] (April 20, 2012)
- Werewolf: The Last Generation [[Custom] Virtual Tabletop D10] (January 17, 2012)
- Weyrmount II [[MOO] LambdaMOO 1.8.1 / High Wired enCore 1.1 / FUP 1.8] (March 24, 2000)
- Wheel of Time [[Circlemud] Circle] (May 28, 2007)
- Wheel of Time: Winds of Change [[Custom] C# based] (February 16, 2007)
- Where No One Has Gone Before [[MOO] LambdaMOO 1.8.1 (wno-3.0.2 variant)] (June 11, 2012)
- WikiMUD [[Custom] ] (June 30, 2012)
- WileyMUD III [[Dikumud] lots of bits and pieces stuffed in here] (February 24, 2008)
- WindyCity MUX [[MUX] MUX 2.6.5.26] (June 15, 2008)
- Wing Commander: Gemini Sector [[MUSH] ] (April 2, 2012)
- Wing Commander: New Horizon [[MUSH] PennMUSH with custom systems] (December 28, 2011)
- Winter Moon [[Rom] Cold Rock v0.7] (May 25, 2011)
- Winter's Edge [[MUX] MUX 2.7.2.20] (September 26, 2010)
- Winter's Oasis [[MUCK] MUCK] (February 26, 2011)
- Winterkill [[LP] customized LPC driver] (June 21, 2011)
- Witchcraft and Wizardry [[MUSH] PennMUSH] (August 16, 2012)
- WolvesBane Rock [[Dikumud] SillyMUD/Diku] (December 19, 2008)
- World of Naruto [[Rom] Rom2.4b] (February 24, 2010)
- Worlds of Carnage [[Dikumud] Heavily Modified Code] (January 1, 2006)
- Wormhole MUD [[Circlemud] Heavily modified] (July 26, 2007)
- Wunderland [[LP] LD 3.2.11] (April 12, 2006)
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