Developers and Publishers

BitShifters
Several invented poker game variations.
http://bitshifters.com/poker.html

BVS Development Corporation
Develops and distributes solitaire and video poker card games.
http://www.bvsgames.com/

Invented Card Games
Rules for a number of recently invented card games.
http://www.pagat.com/invented/

Joker High
Rules for the game invented by Michael Lawson.
http://www.jokerhigh.net/

Legend Games
Publishes Age of Heroes. Includes game information and educational benefits.
http://www.legendgames.net

M.E.K. Games
Producing a series of medieval fantasy card games beginning with Armory.
http://www.mekgames.com/

Ninety-Nine
Exact bidding game where players lay aside three cards from their hand representing their secret bid, and play the remaining nine cards to tricks.
http://www.pagat.com/exact/99.html

The Official Rules for Buh
A simple but addictive betting game for two to eight players. Introduction, rules, history and variants.
http://www.alcyone.com/max/projects/cards/buh.html

Tredici
The rules to an invented game in which players try to collect all the cards of one suit before the others.
http://www.theworldofstuff.com/tredici/

Two Way Street
Rules of the game, for two or more players.
http://www.angelfire.com/games2/2waystreet/

U.S. Games Systems, Inc.
A wide variety of tarot cards and card games.
http://www.usgamesinc.com/

Wyoming Cowboy
Rules, strategy and a FAQ about the game.
http://www.wyomingcowboy.org/