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.
Poptropica - Poptropica, a virtual world for kids to travel, play games, compete in head-to-head competition, and communicate safely. Kids can also read books, comics, and see movie clips while they play.
Toontown Rewritten - Toontown Rewritten is a Free to Play, Browser-based, MMORPG, and Virtual-World video game developed and published by Disney.
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.
Goatlings - Goatlings is a Freemium, Massively Multiplayer Online, Role Playing, Virtual World and Browser-based video game.