Neopets - Neopets is an Amazing, Virtual World, Massively Multiplayer Online, Role-playing and Fantasy-based video game developed and published by Viacom.
MySims Kingdom - MySims Kingdom is based upon The Sims series but provides special and extremely different gameplay to the original series making it definitely worth your consideration.
Toontown Rewritten - Toontown Rewritten is a Free to Play, Browser-based, MMORPG, and Virtual-World video game developed and published by Disney.
YoWorld (Yoville) - YoWorld or formerly known as Yoville, is an Action, Browser-based, MMO, RPG, Single-player and Multiplayer, Social networking, and Virtual World Simulation developed by Big Viking Games.
Webkinz - Webkinz is an Animal-based, Virtual Children’s World, Fantasy and Browser-based Simulation developed by Ganz.
Tinierme - Tinierme is a Massively Multiplayer Role-playing, Fantasy, Virtual World, and Browser-based Life-Simulation.