Mountain Vista Software - A battleship game. Contains screenshots and demo download. [Windows] - http://www.mountainvistasoft.com/
GNMM - Gnome version of Nine Mens Morris with an AI opponent, rule and board options, and support for both console and GUI play. (Open Source, GPL) - http://gnmm.sourceforge.net/
HB Othello - The popular board game for Windows featuring computer opponents with multiple difficulty levels. - http://www.hbteng.com/Prod06.htm
Batalla Naval - Networked, multiplayer battleship game for Gnome. - http://batnav.sourceforge.net/batnav-en.html
Monopolie - Clone of the original board game Monopoly for Windows. It includes property, chance, and community chest cards as well as sound effects. [Open Source, GPL] - http://monopolie.sourceforge.net/
Automotive Conservation - Interactive game for Windows or Macintosh by Ford Motors to educate consumers about both environmental issues and automotive maintenance. - http://www.automotiveconservation.com/home.shtml
Shogi Variants - Windows program to play the Japanese member of the chess family of games or one of 16 other ancient and modern Shogi variants. - http://www.netspace.net.au/~trout/
Hex - A two player strategy board game for windows in which the object is to connect two sides of the board with your tiles. - http://www.rekenwonder.com/hex.htm
Dara - A Windows version of the African game of Mancala. - http://www.rekenwonder.com/dara.htm
Happy End - Othello variant for Windows that allows you to play the end games of thousands of real matches played by world-level champions. Features several board designs and statistics reports. - http://www.fngo.it/happyend.asp
Tenes Empanadas Graciela - A clone of the Risk, the turn-based multiplayer strategy game for Linux. - http://teg.sourceforge.net/
Gipf for One - Network players on Linux or Windows introduce one piece into play until achieving four-in-a-row. [Open Source, GPL] - http://gf1.sourceforge.net/
Expert Backgammon - Flexible backgammon game for Java with internet play and computer analysis of moves. - http://www.lpsci.com/software/html/backdesc.html
Space Monopoly - A simple logical game of buying and selling shares. Requires Windows. - http://space.monopoly.iwarp.com/
Valvo - Board game for Windows in which you race an opponent and try to block her good moves by opening and closing valves. - http://familygames.com/free/valvo.html
PegSol - Remove all the pegs except the last, which should be left in the center of the board. This Windows version includes a solution finder. - http://www.extrabit.com/freestuff/
Do'SSi Zo'la - One or two player opponent blocker for Windows or Linux. [Open Source, GPL] - http://dossizola.sourceforge.net/
Generic Universal Boardgame - Play almost any board game: backgammon and checkers pieces are available or you can create your own. (Requires Java 2) - http://ludo.iwarp.com/