Animal jam.com and moshi monster.com also clubpenguin.
runescape
no
Xivio.com is great! Its a 3D no download free virtual world!!!
There are 2 that i know of dragonopia and evodragon
WebkinzMeezThere.com
Yes
meez
Yes second life
club penguin.com zwinky.com chitchatcity.com wee world.com
FreeRealms is a site where you must download it but it is totally free.
Poptropica
Probably the top ten virtual world games!SmallworldsBinweevilsclub penguinmoshi monstersWebkinzPandandamydinosStardollIMVUPoptropica