Tsunami MUD
1990Persistent fantasy LPMud/MMORPG · Free-to-play
Category
Browser MMOs
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Tynon
—Browser MMORPG · Not yet verified
UFO Online
—Browser tactical MMO · Not yet verified
UKMAFIA
2026Text-based crime MMORPG · Free-to-play
UltraCorps
1998Sci-fi turn-based MMO strategy · Not yet verified
Unification Wars
—Browser strategy MMO · Not yet verified
UNItopia
1991German fantasy LPMud/MMORPG · Free-to-play
Unlimited Ninja
—Browser MMORPG · Not yet verified
Unwritten Legends
2005Text-based medieval fantasy MMORPG / MUD · Free-to-play
Urban Dead
2005Horror turn-based MMO strategy · Not yet verified
Utopia
1996Sci-fi turn-based MMO strategy · Not yet verified
Valiant
2026Idle browser MMORPG · Free-to-play
Vanya Online
2026Dark fantasy idle MMORPG · Free-to-play
Varidian
2026Browser MMORPG · Free-to-play
Veilbound
20263D dark-fantasy browser MMORPG · Free-to-play
Velderis
2026Fantasy browser MMORPG · Free-to-play
VertexOrbit
2026Browser space MMORPG · Free-to-play open beta
Vikings: War of Clans
2015Fantasy strategy MMO · Free to play with item shop
Virtual Realities
2000Social LPMud persistent world · Free-to-play
Waddle World
2026Social browser MMO · Free-to-play
War of Legends
2010Fantasy MMORTS · Free to play with item shop
Waystone
2026Old-school browser MMORPG · Free-to-play / open alpha
WildGuns
2007Wild West browser strategy MMO · Free-to-play
World of Claudecraft
2026Open-source browser MMORPG · Free-to-play / open source
World of Dungeons
2003Browser fantasy MMORPG · Free-to-play / optional premium
World of Warlords Online
2026Browser fantasy MMORPG · Free-to-play
World Tree MUSH
2010Multitheme roleplay MUSH · Free-to-play
Wyvern
2001Old-school graphical MMORPG · Free-to-play
X-Wars Resurrection
2026Browser space strategy MMO · Free-to-start / subscription
Xhodon
2008Persistent fantasy browser strategy MMO · Free-to-play
Xhodon 2
2019Persistent fantasy browser strategy MMO · Free-to-play
Zebedee
1990Fantasy LPMud/MMORPG · Free-to-play