Pokemon Crater

In this game you can catch and train your own Pokemon, earn badges, and battle other players. Note: The original Pokemon Crater is currently offline. No word on whether it will come back. For an RPG with pets, magic and skills, try Adventure Quest.

Free to play indefinitely.

Sugar Rush

Sugar Rush is a online action game with a smash brothers feel. Customize your character, choose your class, and fight the Chromies or other players for spark and money. Really fun!

Free to play indefinitely.

Virtual Magic Kingdom

Quests, magic, chat, and adventure in a magical world based on Disney's theme parks. NOTE: This game has been retired. Try Virtual Family Kingdom instead.

Free to play indefinitely.