What are some free websites for kids

Some free kids sites are:

www.Poptropica.com (a fun game with different islands and adventures)
www.Funbrain.com (an educational website, but with fun games)
www.Neopets.com (a game with virtual worlds, stores, and a Neopets community)
www.Webkinz.com (a game where you take care of virtual pets, play games, and earn KinzCash. Free accounts are now available)
www.Clubpenguin.com (a game where you can create your own penguin, explore the island, and participate in a wide variety of other activities)

There are lots of virtual-pet games like Handiponts.com, YaketyYakPets.com, Chickapets.com, PetNebula.com, PowerPets.com, MoshiMonsters.com, GoPets.com, etc.