Try Xivio.com, its a free 3D virtual world! No download too!
VirtualFamilyKingdom.com is also free and is a cool 3d virtual world, and no downloads.
ClubPenguin.com is kind of 3d
Dizzywood.com is nice and 3d
Moshimonster.com
Whyville.com
MoshiMonsters.com ClubPenguin.com
there issmallworldsmovie star planethowseweeworld
Meez!
well there one i know switchin it a wedsite with 4 virtual worlds
Smeet is a Very good virtual world. I love it
Any Virtual Worlds For Teenagers Were You Can Be A Fairy
Yes there is EG: Second Life, IMVU..........
nijit101
It is poptropica.
yes there is. fantage. fantage is a wonderfull place. :).
roblox
Xivio.com is great! Its a 3D no download free virtual world!!!