all need logins except for girlsgogames. it isn't a virtual world but you can play a wide range of games
MoshiMonsters.com ClubPenguin.com
secretbilders
Neopets
Try Xivio.com, its a free 3D virtual world. Safe for kids! No download too!
Free Realms is my favorite, it's fun, free, and awesome!
Webkinz.com, babydow.com, pixiehollow.com, superpokepets.com, and howrse.com are all good Web sites for kids.
here are 3 jumpstart free realms clubpenguin
Bin weevils, fantage, secret builders, runesqape, world of warcraft, small worlds, our world
yes there is. fantage. fantage is a wonderfull place. :).
aq worlds, call of duty modern warfare, toontown, etc
you can go on moshimonsters.com webkinz.com clubpenguin.com weeworld.com and many more!
moshi monsters binweevils moviestarplanet fantage club peinguin