Are there any virtual worlds to play that you dont have to download or pay?

[Jilian Rocketon]

OMG I'm a virtual world freak!! I know a lot of sites like: Ourworld
FusinFall
Ninerift
Moshi Monsters
Small Worlds
Meez
Habbo
Fantage
Gaia Online
Sooo.... TELL ME MORE PLEASE!!!!!!!!!