The Mana Bros Call of Cthulhu Pages Resources, including the regularly updated "Turin (Italy)Guidebook" for 1920s, short Lovecraft bio and Italian Publishing History, Book of Characters: professions and generation rules (MSWord Zip); Niteside Dreams, alternate setting for Call of Cthulhu games using Film Noir conventions in a magic-rich world subtly corrupted by the Mythos.
Byakhee Windows WYSIWYG computer program, investigator generator for any era and Delta Green, prints telegrams. Free, download source code.
Tales of Terror A collection of grisly ideas for use in Call of Cthulhu and other games. Each Tale is a short horror scenario description, "stripped clean of rotting statistics and wretched prose", a paragraph or so, with three alternate Possibilities for developing the events behind the mystery.
Scooby Doo Cthulhu Will the horror never cease? Stats for the 5 cartoon characters in CoC format. Jinkies!
Propping up the Mythos A guide to making objects from the stories of H.P. Lovecraft. Resource for making props for Call of Cthulhu or Cthulhu Live games.
Shoggoth.net: An interactive weblog, forum, and article archive for the Mythos & Call of Cthulhu RPG Community. Current and updated often.
Berkley Cthulhu Archive A collection (somewhat dated) of mailing list archives, character sheet templates, character generators, pictures and other miscellaneous items. Most of the material dates from 1993-1996.
CoC CharGen OpenSource character generator written in Java. Released under the GNU GPL.
Vampulhu! Conversion rules and design outline for a Vampire: the Masquerade / Call of Cthulhu hybrid RPG under White Wolf rules.
CTHULHU International CTHULHU International provides support to Call of Cthulhu RPG and its Pagan Publishing Supplements; Delta Green, players and Keepers and to promote the writings of H.P. Lovecraft.