Paragon Bridge
Paragon Bridge (Full Version) is a Contract Bridge card game which features both offline and online (internet) game play. Sports superb graphics and is ideal for both novice and professional players alike. Those new to the game of Bridge will appreciate the built-in Bid Buddy help balloons which... Includes a Bridge tutorial for those wishing to learn this fantastic 'grandfather' of all card games. ... Play against your PC in offline mode or pit your wits against other players from all around the world in our online Bridge club.
http://shareware.qed-online.com/index.cgi?x=download/BLITE.EXE - 2Mb - Download - Screenshot

Tutorial Bridge
Tutorial Bridge is a program for learning the game of contract bridge while at the same time playing and enjoying the game. This self-playing computer program gives the reasoning behind each non-trivial bid that is made, or card that is played. The user can interact with the program at a rate... At each successive level, more aspects of the bidding for contract bridge are introduced. ... No need to absorb all kinds of details about bidding, card play, and scoring before you have any fun at playing the game of bridge.
http://learnbridge.com/tb_setup.exe - 4Mb - Download - Screenshot

XContractBridge
Linux Contract Bridge simulation with random deal, Acol bidding, score to rubber, Blackwood, Baron, Jacoby and Stayman conventions.
http://www.xcontractbridge.com/XCBRIDGE - 2Mb - Download - Screenshot

Danzig Pref Engine
Program for playing card game 'preference' (pronounced preferAns), which is very popular in Russia and Eastern Europe. This contract card game is easier than bridge but requires skill, memory and luck. You can play against a computer AI as well as against other people using TCP/IP. ... Sochi and Leningrad variations + many parameters of the game available.
http://rugila.chat.ru/pref/danzig.zip - 491Kb - Download - Screenshot