A downloadable game for Windows
Skullball is a two player volleyball game. It can also be played versus AI but is recommended for friend based tournaments with "beverages". Rules can be switched: How heavy the ball is, how high do players jump etc.
You will need some unzipping program like 7-zip ,winrar or other like those to open this.
Atleast 7-zip is free http://www.7-zip.org/ ,maybe even winrar.