When comparing VASSAL vs ZunTzu, the Slant community recommends VASSAL for most people. In the question“What are the best software tools for playing tabletop games over Internet?” VASSAL is ranked 3rd while ZunTzu is ranked 6th. The most important reason people chose VASSAL is:
The source code is available [here](https://svn.code.sf.net/p/vassalengine/svn/), licensed under LGPL v2.1+.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Free and open source
The source code is available here, licensed under LGPL v2.1+.
Pro Tons of free game modules you can download
Pro A vast community that provides a great selection of games
Vassal engine allows downloading user pre-made games, called modules, from a public repository. There currently are over a 1.5k modules.
Pro Active develeopment
Vassal engine is actively maintained with a new release every other month or so.
Pro Cross-platform
VASSAL is available natively on Windows, OS X & Linux. See downloads page.
Pro Over 200 games
Pro Free
Pro Built-in audio chat
Cons
Con No longer updated for newer versions of Java
Vassal doesn't support any versions of Java after version 8.