U.S. Games Systems, Inc.

A wide variety of tarot cards and card games.
http://www.usgamesinc.com/

BitShifters

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

Joker High

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

Invented Card Games

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

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/

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

Two Way Street

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

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

M.E.K. Games

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

Legend Games

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

BVS Development Corporation

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