Pet pet park is one.
Your question doesn't make sense.
There are many sites, one of which is marapets but the site isn't as sophisticated as neopets i think.
Try muglets.com Its not the best but it is fun!
neopets, moshimonsters, webkinz, millsberry, adopt me, The last one is miniclip but it isn't exactly the same. Read this and join these website. They are great and fun for kids. All of them are safe. Im sure you have heard of at leats one of them
Chokato
Neopets and Club Penguin are similar sites like Millsberry. Runescape, Habbo, Toontown are also great sites where you can play games like on Millsberry.
neopets millsberry barbiegirl habbo adoptmenow.com poptropica
DON'T STEAL! And they wont allow it like neopets in neopets other people steal from you so be aware
Neopets or Millsberry, their not the same, but their both very fun too.
Icepets?
there are many other websites like neopets, one is webkinz
Yeah I know a bunch:Zwinky,Webkinz,MAFkidsclub,Clubpenguin,Millsberry,Neopets,Fantage,IMVU and toontown
Yes like www.neopets.com mysims.com
Some websites like Neopets are :Webkinz.comShiningstars.comBuildabearville.comClubpenguin.comMillsberry.comMarapets.com is closest to Neopets (but IDK ( I don't know ) if there is a website better than Neopets! :D)
Marapets
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.
Club penguin, Millsberry, Poptropica, Neopets and Gushers.com. I hope this helped!