Flyff is probably the best one out there. Wizard101 is pretty good, too. I highly recOmand flyff as wizard101 is pricey and a bit young for teens those ages.
No, all virtual worlds require software to download.
Fantage.com
Weeworld.co.uk
imvu is a game for only teens so be carful kids
super secret
I think it's called evoy.
ourWorld IMVU and many more!
Smeet is a Very good virtual world. I love it
there is meez.com secondlife kaneva clubpenguin poptropica
There are about tons of virtual worlds... Second Life is popular but only for teens You should try ourworld ;]
a free virtual world is an online world. where you can chat like facebook. you can have private chats but mostly when you chat the public can see(those which are playing). and you can play too. for 12 and under i would recommend club penguin and moshi monsters and poptropica. for 13 or 12 and above (teens) i would recommend stardoll and woozworld. there are still lots more free virtual worlds on the internet. tough i usually play on those virtual worlds listed above.
clubpenguin.com poptropica.com habbo.com (this is a really good one for teens) neopets.com