Game Databases

Allakhazam
Database site offering information on items, quests, mobs, spells, and talents.
http://wow.allakhazam.com/

Crafter's Tome
Specialized database dedicated to crafting and tradeskills.
http://wow.crafterstome.com/home.html

The Goblin Workshop
A database of quest spoilers, zone guides, item data, and monster information.
http://www.goblinworkshop.com/

Lootables
Offers item search (with comparison tool) and in-depth profession guides.
http://www.lootables.com/

Thottbot
Database for quests, mobs, spells/abilities, maps, and items, updated through players transmitting data from an in-game interface plugin.
http://www.thottbot.com/

WhizzardBase
A quests search and quests tracker which tracks active and completed quests.
http://www.WhizzardBase.com/

World of Warcraft MMODB
Offers content on quests, bestiary, and equipment in one database.
http://wow.mmodb.com/

WoW Arsenal
A database with semantic search.
http://www.wow-arsenal.com/

Wowdigger
Offers game information gathered direct from the game with comments and screenshots.
http://www.wowdigger.com

Wowhead
A database website for World of Warcraft.
http://www.wowhead.com