Allakhazam is a website that offers online searchable database for many massively multiplayer online games currently on the market. It started as an information website centered around Everquest, and expanded to include multiple MMO Games. It's biggest sites are for World of Warcraft, Final Fantasy XI, Everquest 2, and Everquest. It has a World of Warcraft database very similar to Thottbot in that it uses an AddOn to collect and upload WoW data to a browse-able website database with similar data, as well as character profiles, and quest data. It also has a set of popular forums for WoW.
Allakhazam's method of getting data is their program called WoWreader.