Based on a "generic fantasy mishmash" theme. Taking inspiration from several different sources, it allows for both coded and non-coded (role-play) interactions. Thematic and introductory information available at the site.

CastleMoo is a roleplaying/social MOO in a medieval time period. Taking place inside of a large town named CloudCity, the MOO offers great opportunities for new and old alike.

Based on a fictional city in the United States, similar to current cities. Offers a webinterface to rooms, objects, help pages and players.

Post-apocolyptic theme, large loyal playerbase, strict roleplaying game adherence (generally), guns, bombs, mutants, wastes and a tribute to natural selection. Site provides information about the game and how to play it.

Medieval based MOO with coded combat, although non-coded RP is encouraged. Sites offers information about the MOO, a player list and access to the MOO's mailing lists.

Set in 2085, in a domed city in a post-apocalyptic world. Cybernetics, a 3D layout system, high technology, high style and low class in one. Site offers information about the MOO and the people who play it.

Science-fiction themed MOO situated in the aftermath of a major catastrophe which caused a large wormhole to become a universe sucker. Three races, the Humans, the Kzinti and the B'ortha have been trying to flee this disaster. Site provides information about the MOO and its theme.

An extensive, heavily coded MOO based on the Myst series by Cyan, Writers of D'ni is a well done recreation of the Myst world. It is centered on the underground city of D'ni, timed during the height of the D'ni Empire.