webkinz.com (kinda but you got to buy the pet)
dizzywood.com ( I don't know if its really 3d or 2d but its sooooo fun
heres 2d kinds
fantage.com (real fun)
winxclub.com (fairy is the females when registering specailist is boys)
zookazoo.com ( I think they are temporairaly shut down because they don't heve enough money from subscribers to keep it up)
um I don't know any more at the moment hope you have fun!
poptropa.com is like toontown on poptropica you can go on quest play games and chat with each other and if your like me you will be addicted to it after a week or 2 and its free but you have to make a account but its free its really simple too just type in www.poptropica.com
I haven't played Toontown, but I like playing games and I do understand how you feel when the game is finished and you want to find a similar game as quickly as possible. Here I can recommend to visit http://gameroze.com/games-without-downloading/. This source provides me with the good variants. Hopefully, you will also find it helpful.
my favorite games that you will love
honestly I like zwinky
Tootsville (kinda babyish but kinda fun) whyville (ok ish) spineworld (its fun you can decorate your apartment, do quests and chat and play games and stuff) Club penguin( I totaly love this game, therez a loda stuff to do on it) poptropica( never played it but I think its good) moshi monsters (it looks babyish but its fun) hope this helped. P.s. Wisard101 and runescape.! .
P.S: Y DID you QUIT TOONTOWN!!!! ITS THE BEST!
Here it is: Www.thekingdomkeepers.com
try out halo3rec0n.weebly.com( its not a game though but leave a comment tell your friends)