What are some really cool online games?

I’m kinda bored of the online games i’m playing now.
These are the the games that im playing now.(I also don’t want you to list any of these):
neopets
runescape
clubpenguin
unicreatures
marapets
howrse
bellasara
toontown
Also I don’t want to pay for any of the websites you list.
It ok if I have to pay for certain parts of the game as long as other parts of the game are free and I don’t want to download anything.