Wikipedia: Category:Anti-cheat software - Collection of articles on different anti-cheat software packages. - http://en.wikipedia.org/wiki/Category:Anti-cheat_software
Wikipedia: Valve Anti-Cheat - Encyclopedia article covering anti-cheat measures used in Counter-Strike, Half-Life Multiplayer, and other games distributed on Valve's Steam platform. - http://en.wikipedia.org/wiki/Valve_Anti-Cheat
Counter Hack - Wiki offering resources to combat cheating in multiple games. - http://wiki.counter-hack.net/
Wikipedia: Cheating in online games - Encyclopedia article covering types of cheats, implementations, and prevention methods. - http://en.wikipedia.org/wiki/Cheating_in_online_games
PBBans - Offers a "Master Ban Index" among networked game servers. - http://www.pbbans.com
ComputerAndVideoGames.com: Trick or Cheat - Article on the problem of cheating in multiplayer games and what is being done to combat it. - http://www.computerandvideogames.com/article.php?id=143973
DMW - Third-party anti-cheat software originally developed for "Medal of Honor: Allied Assault" and expanded to protect other games. - http://www.dmwworld.com/
Respected Admins - System administrator community dedicated to anti-cheating with a focus on Punkbuster supported games. - http://www.respectedadmins.com
Wikipedia: GameGuard - Encyclopedia article covering the software, including criticisms. - http://en.wikipedia.org/wiki/GameGuard
GameGuard - Anti-cheat software from INCA Internet. - http://eng.nprotect.com/nprotect_gameguard.htm
BBC News - Coverage of Valve Anti-Cheat (VAC) in Counter-Strike. - http://news.bbc.co.uk/2/hi/technology/2221335.stm
Anti Cheat Collective - Coalition of squads dedicated to fair play and the prevention of cheating, primarily in Battlefield 2. - http://bhd-acc.com
AntiCheat Inc - Battlefield 2142 and America's Army system administrator anti-cheat community. - http://www.anticheatinc.com
PunkBuster - Anti-cheat software incorporated in some of the more popular online, multiplayer shooters, including the Battlefield series. - http://www.punkbuster.com/
Anti-Cheat: Limited Trust in Online Gaming Communities - Article discussing the failure of current anti-cheat mechanisms and suggests the implementation of a "network of trust". - http://michael.bacarella.com/papers/netoftrust.html
PlayNoEvil - Weblog focusing on game security and on the farming and sale of game valuables in online RPGs. Partial focus on Asia. - http://www.playnoevil.com/
PunksBusted - Anti-cheat organization, supporting all PunkBuster enabled games. Home of the Auto-MBL, a large scale ban list system with thousands of member servers. Forums available in English, German, and French. - http://www.punksbusted.com/
SecurePlay - Offers programming libraries to incorporate anti-cheat measures which work even if the source code is compromised. - http://www.secureplay.com/