Wiki

A wiki is a website that anyone can edit. For more information, see the article about wikis on Wikipedia, the wiki-based free encyclopedia.

Wikis with Doom content:

• This project, the Doom Wiki (http://doom.wikia.com/)
• The ZDoom documentation project (http://zdoom.org/wiki/)
• The Doom Legacy Wiki (http://legacywiki.net/) — note that this is not GFDL, and material from the Legacy Wiki should not be copied into the Doom Wiki
• The Eternity Wiki (http://eternity.youfailit.net/)
• The Vavoom Wiki (http://www.vavoom-engine.com/wiki/)
• The DoomRL Wiki (http://doomwiki.chaosforge.org/)
• The Doomsday Engine Wiki (http://dengine.net/dew/)
• The Chocolate Doom wiki (http://www.chocolate-doom.org/)

Wikipedia also has a fair amount of Doom coverage; see, for example, Category:Doom.