I don't see any reason why it would be Windows only. All the code appears to be spec-compliant C# that doesn't use P/Invoke to call native modules or rely on C+

I don't see any reason why it would be Windows only. All the code appears to be spec-compliant C# that doesn't use P/Invoke to call native modules or rely on C++/CLI. The only sticking point I see is the PowerShell script, and that's pretty trivial to replace since it's just a build script (you could use xbuild/msbuild, since mono supports that, or just use make)