MzingaViewer is part of Mzinga: a collection of open-source software to play the board game Hive, with the primary goal of building a community of developers who create Hive-playing AIs.
MzingaViewer is a viewer which can drive any game engine that implements the specifications of the Universal Hive Protocol. It is not meant to be graphically impressive or compete with commercial versions of Hive, but rather be a ready-made UI for developers who'd rather focus their time on building an AI.
For more information about Mzinga or the Universal Hive Protocol, see https://github.com/jonthysell/Mzinga
Note: MzingaViewer does work in S mode, however you will be limited to using the internal engine.