Atlas games - Ars Magica
   Publisher's site. "Come to a land of adventure and mystery, of falling empires and rising nations, of legendary creatures and incredible myths. This is Ars Magica's Mythic Europe, where the power of magic is real and exists alongside historical figur
   http://www.atlas-games.com/arsmagica/

Cliffheart Covenant
   A nicely laid out site about Ars Magica that was originally done in Italian, but has now been translated to English.
   http://www.arsmagica.it/Cliffheart/index-en.htm

Hermes' Portal
   A fanzine about the game.
   http://perso.orange.fr/styren/hermesportal/hermes.htm

Insula Maledictus
   Provides characters, relations, stories, history, spells, magical items, letters, essays and in-game and off-game material.
   http://germanitas.org/Insula/

Project Redcap - The Crossroads of the Order
   Features an Ars Magica FAQ, mailing lists, resources, and a large link collection for multiple languages.
   http://redcap.org/

Rabenstein Covenant
   Offers characters, maps of the covenant, house rules, summary of the saga, and historical background.
   http://www.unc.edu/~murphy/rabenstein/index2.html

Secretum Secretorum
   Background for the game, contains information from a text translated from Arabic in the middle of the twelfth century.
   http://www.granta.demon.co.uk/arsm/jg/index.html

Wikipedia
   Contains history, setting, system information, and references.
   http://en.wikipedia.org/wiki/Ars_Magica