Tibia

The Cobalt Tower
Offers information on many aspects of the game.
http://www.tibia-alumni-society.net/cobalt-tower/

Erig.net
A database of Tibia statistics and resources.
http://www.erig.net

MyTibia
Tibia trading center. Information on item prices on different game worlds. Translated in 8 different languages.
http://www.mytibia.com

Open-Tibia.com
A resource with downloads, forums, and tutorials.
http://www.open-tibia.com/

Tibia guides
Source for all kind of guides, tutorials and articles.
http://www.tibia.miu.pl

Tibia Micro Edition
Official Homepage of Tibia Micro Edition, the first mobile online roleplaying game.
http://www.tibiame.com/home/

TibiaNews
News, encyclopedia, guides, and forum.
http://www.tibianews.net

Wikipedia
Encyclopedia article describing the game and its history.
http://en.wikipedia.org/wiki/Tibia_%28computer_game%29

World of Dking
Contains information on books found in the game as well as a player's personal experience with the game.
http://galeon.com/dking

World of Tibia
Unofficial site featuring downloads, screenshots, maps, and links to other sites. Site is presented in both German and English.
http://tibia.gamigo.de/