Neopets - Neopets is an Amazing, Virtual World, Massively Multiplayer Online, Role-playing and Fantasy-based video game developed and published by Viacom.
Panfu - Panfu is really a virtual world focusing on kids aged between 5 and 14.
Toontown Rewritten - Toontown Rewritten is a Free to Play, Browser-based, MMORPG, and Virtual-World video game developed and published by Disney.
Star Stable - Star Stable is a Massively Multiplayer Online, Virtual Horse, Fantasy and Browser-based Simulation developed by Star Stable Entertainment AB.
Webkinz - Webkinz is an Animal-based, Virtual Children’s World, Fantasy and Browser-based Simulation developed by Ganz.
Marapets - Marapets is an Amazing, Massively Multiplayer Online, Role-playing, Browser-based and Virtual World video game like Pet World and Neopets.