There is Fantage.com
and there is miniclip.com/players,
webkinz.com,
ourworld.com
spineworld.com,
Runescape.com,
awsomehouseparty.com,
fishland.com,
dizzywood.com,
clubpenguin.com,
nicktropolis.com,
imvu.com,(not really for kids)
tootsville.com,
Cartoondollemporium.com (I have one of these its really fun mine is=sweetie448 and if you make one add me!),
and stardoll.com
Heres some:
Habbo
stardoll
Dollar
dizzywood
warbear
xiovio
planet cazmo
chobots
kidz world
smallworld
I think I helped you