Oyun is available as a binary package for Windows and Mac, as well as C++ source which can be compiled on a wide array of systems. The current binary version is v2.0 Beta 6, released on June 1, 2018. In source-code form, there is a slightly more recent version (Beta 7.1), which fixes compilation on recent versions of Mac OS X.
Oyun v2.0 Beta 6 installer for Windows
Oyun v2.0 Beta 6 installer for Mac OS X
Oyun v2.0 Beta 7.1 source code (.tar.gz)
Example Finite State Machines:
Tit-for-tat
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AW (cheater detection)
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Host
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Parasite
(last two to be used together)