Webkinz isn't really free, you have to buy the plush toy. But free websites like that are neopets, and clubpenguin. Probably more but I think these are the best ones.
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Well, you could play Webkinz if you wanted to...
there is clubpenguin,neopets,happydog,
Club Penguin, Pet Pet Park, Webkinz, Neopets
Club Penguin, Webkinz, Runescape, Habbo Hotel, pixie hollow.
Free games are available to play at places like AOL games.