Free virtual worlds for kids

Well I know lots of fun and FREE games:

Ecobuddies
Pandanda
storyjumper
Sparkcity
Woogi world
Ty girls (Need to buy a Ty girls doll)
Webkinz (HAVE TO buy a webkinz plush toy or it won't let you play)
Buildabearville
Wiglington and Wenks
Secret builders
Wizard101 (Download)
Hello Kitty Online (Download)
Pixie Hollow
Woozworld
Panfu
LPSO (Now CLOSED!)
Toontown
Club Penguin
Moshi monsters
Fantage

And that are all of the free virtual worlds that are FREE and for kids that I can think of. Hope I helped!