Ben 10 Planet
Ben 10 Planet is a collaborative online encyclopedia (in ordinary English, a wiki) all about the Ben 10 Franchise: Ben 10, Ben 10: Alien Force, Ben 10: Ultimate Alien, and the unnamed fourth series rumored to be called Ben 10: Omniverse.
It is maintained by admins Ben2themax, Blaziken rjcf, Costas3, Linkdarkside, PlasmaTime, Superbike10, and all the other users who help out by keeping it full of info.
Anyone, and I mean anyone can create an account and edit, even though anyone can edit and even create pages without one. They're very strict on fan fiction and unconfirmed/outright fake info, so watch out! Save the fan fiction for its sister wiki, Ben 10 Fan Fiction.