|Developer(s)||The VASSAL Team.|
|Stable release||3.2.4 / April 8, 2013|
|Available in||Multilingual (English and 6 other languages)|
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. 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 VASL (Virtual Advanced Squad Leader), an application for playing Advanced Squad Leader.
Interview with Rodney Kinney, designer of the VASSAL Engine.
Available modules 
VASSAL modules exist for over 800 games, some of which are listed here. A more comprehensive, but not exhaustive, list of modules exists on the VASSAL module site list.
- V40k, a Warhammer 40,000 module. Perhaps the most played module now.
- Battlefleet Gothic 
- Mordheim 
- Star Wars Tactics
- Warmachine and Hordes
Card Games 
Copyright and Licensing 
In September 2008, Games Workshop issued a cease-and-desist order regarding V40k to Tim Davis, the team leader at that time. The module is still played.
Games Workshop has also issued a cease-and-desist order regarding Space Hulk.
- Official VASSAL Website
- Vassal 40k Website
- Download Source for Battlefleet Gothic Module
- Mordheim Module Download
- Warmachine&Hordes Vassal Module Download
- Module Shadows over Camelot Download
- Playing Cards
- Module Site
- GW V40k Legal Action