99
This is an easy adding card game, for 2 or more players, in which the values of the cards are added together as they are played in a single pile (pile score). The object of the game is to avoid taking the pile score over 99.
More information can be found at: http://www.99cards.co.nz/instructions.html

Bridge, Social
Contract or rubber bridge, usually known simply as bridge, is a trick-taking card game of skill and chance (the relative proportions depend on the variant played). It is played by four players who form two partnerships (sides); the partners sit opposite each other at a table. The game consists of the auction (often called bidding) and play, after which the hand is scored.
More information can be found at: http://en.wikipedia.org/wiki/Contract_bridge

Bridge, Duplicate
In duplicate bridge each hand is played at several other tables during the session, under the same conditions. Unlike rubber bridge, which depends heavily on being dealt good hands to win, your final score at duplicate depends only on how well you bid and play the cards you actually hold, not on how "good" those cards are.
More information can be found at: http://www.acbl.org/learn/introDuplicate.html

Bunco
Strictly speaking, Bunco is a game of dice, played in rounds. Players take turns rolling the dice and trying to accumulate as many points as possible to win each round. The game is played at tables of four in competing teams of two. Players will tell you that Bunco is actually a social event. It's a party. It's a blast!
More information can be found at: http://www.worldbunco.com/rules.html

Cribbage
Cribbage is a card game for from two to four players in which the score is kept by inserting small pegs into holes arranged in rows on a small board.
More information can be found at: http://www.cribbage.org/rules/rule1.asp

Euchre
Euchre is a popular card game across a wide area of Canada, from Nova Scotia to the Midwest) and in the USA (especially in the North-East and Midwest), and also in the United States Navy. It is a plain-trick game, usually with four players in fixed partnerships, partners sitting opposite.
More information can be found at: http://www.pagat.com/euchre/euchre.html

Five-Handed Sheepshead
Sheepshead is a card game typically played with three to five players, although two-, six- and even seven-player versions exist. Indeed, sitting down to a game of Sheepshead often involves negotiating table rules, much like poker. In Milwaukee, a five-handed version seems to be the most popular.
More information can be found at:

Hand and Foot
Hand and Foot is a North American game related to Canasta, in which each player is dealt two sets of cards - the hand, which is played first, and the foot, which is played when the hand has been used up. There are numerous variations of this game and no standard rules.
More information can be found at: http://www.pagat.com/rummy/handfoot.html

Mah Jongg
Mah Jongg is a tile game for four players that originated in China. Mah Jongg involves skill, strategy, and calculation, as well as a certain degree of luck. Depending on the variation which is played, luck can be anything from a minor to a dominant factor in success.

More information can be found at: http://www.mahjongg.com/begin.htm

Mexican Train
Mexican Train is a domino game, played mainly in the USA. It is probably best for four or more players. There are a number of versions of this game.
More information can be found at: http://www.pagat.com/domino/train.html

Pegs & Jokers
This is a wooden board game played with cards and pegs going around the board (can be played by 2, 4, 6, or 8 people.
More information can be found at: http://sg.answers.yahoo.com/question/index?qid=20060624110412AA2mxwo

Pinochle
Pinochle is a trick-taking game typically for two, three or four players and played with a 48 card deck. Players score points by trick-taking and also by forming combinations of cards into melds. Each hand is played in three phases: bidding, melds, and tricks. Variants of Pinochle can be played with three, five, six, eight or more players.
More information can be found at: http://en.wikipedia.org/wiki/Pinochle

Poker
Poker is a popular type of card game in which players gamble on the superior value of the card combination ("hand") in their possession, by placing a bet into a central pot. The winner is the one who holds the hand with the highest value according to an established hand rankings hierarchy, or otherwise the player who remains "in the hand" after all others have folded (the player who makes an un-called bet). Poker has many variations, all following a similar pattern of play.
More information can be found at: http://www.poker.com/game/

Rummikub
The object of Rummikub is to be the first to eliminate all the tiles from your rack by forming them into sets of runs and groups, and then melding them onto the table. Your objective, therefore, is to keep as few points in your hand as possible.
More information can be found at: http://www.pagat.com/rummy/rummikub.html

Scrabble
Scrabble is a word game in which two to four players score points by forming words from individual lettered tiles on a game board marked with a 15-by-15 grid. The words are formed across and down in crossword fashion. 
More information can be found at: http://www.hasbro.com/games/adult-games/scrabble/home.cfm?