I have created a (free) Tori Shogi adaptation using a generic,
free/open-source boardgame/wargame engine called the Vassal engine
(http://vassalengine.org/) which runs on all major OSes, and allows for
both online and play-by-email gaming.
If you would like to give it a shot, the beta can be found in the
'Files' section of the Yahoo Group of the same name.
P.