GNU xshogi - A GUI for Shogi-playing software (GNU Shogi and the Internet Shogi Server, in particular). - http://www.gnu.org/software/xshogi/xshogi.html
Shogi Variants - A Windows program for playing a variety of ancient variations on Shogi, from the smallest, to the largest. - http://www.netspace.net.au/~trout/index.html
Shogi Software - Contains downloads for Shogi games for Windows and Windows 98. - http://www.hollandnumerics.demon.co.uk/SHOGISW.HTM