i would say moshi monster Plus its Free!
Secretbuilders.com
wizard 101
imvu and I'm going to say Club Penguin
webkinz is quite like club penguin but not as good with chatting. A good one is tootsville or chobots.
World of Warcraft, Runes of Magic & Runescape just to name a few.
Try SmartFoxServer.
Yes, Club Penguin is a virtual world for kids and is great if you would like to make new online friends or talk to your friends in real life on it.
Tootsville is like club penguin. It is a virtual world where you can play games and make new friends. Occasionally an adult working with tootsville will come on and tell jokes,play games etc to see how things are going. I definitely recommend it :)
There are many games like Club Penguin which you can do more with out a membership but there are none that are good with no cost.
well here are good games like club penguin. Moshi Monsters Binweevles Panfu.
Club Penguin (however club penguin is mostly for younger kids)
Club Penguin, Poptropica,Webkinz(you have to buy one) Buildabearville is a good one so try them i like them!!!