I don't know where this fits but it is like vassal in that you play board games on the computer. I know GJK is into it but I never had a reason to look at it till now.
Academy Games makes the Conflict of Heroes series. I have the Matrix version of the computer game. At AG website is a link to ZunTzu and files to play the COH games.
I have Windows 8 and ZT installs as an app for the Start menu. You play within Internet Explorer. I'll have to read up on it but looks like a good way to try out some board games or play friends online.
I tried it before years ago, but found it inferior (back then at least) to the popular Vassal.