The Vassal Engine is a game engine for building and playing online adaptations of board games, tabletop games and card games. It allows users to play in real time over a live Internet connection, and also by email (PbeM). It runs on all platforms, and is free, open-source software.[1][2] For example, there is a Star Wars Miniatures module, where players can play with up to three others in a digital replica of the table-top game.
Vassal began as an application for playing Advanced Squad Leader. This program was named VASL, an acronym for "Virtual Advanced Squad Leader." In 2002, this was expanded into a generic board game engine now called Vassal, with VASL being changed into just one out of many modules for Vassal.[4][5]
In September 2008, Games Workshop issued a cease-and-desist order regarding the Vassal module for Warhammer 40K to Tim Davis, its maintainer at that time.[7] The module is still played.
