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.
Animal Jam - Animal Jam is really a virtual world for kids that includes real animal and plant information towards fun storylines which are maintained by National Geographic educational content.
Toontown Rewritten - Toontown Rewritten is a Free to Play, Browser-based, MMORPG, and Virtual-World video game developed and published by Disney.
Marapets - Marapets is an Amazing, Massively Multiplayer Online, Role-playing, Browser-based and Virtual World video game like Pet World and Neopets.
Miramagia - Miramagia is an Awesome, Massively Multiplayer Online, Role-playing, Virtual World and browser-based video game developed and published by Travian Games.