I am actually in the process of making it cross-compatible at the moment 
The build you can download here on the thread sort of runs, since it’s C# (Mono and all that) but it has issues and crashes. The Unix version uses GTK, and is available on the Linux branch on GitHub. It does not yet work, since I decided to take some time to refactor and get some better threading in it for speed and stability.
So in short, Linux and Mac on the way from GitHub, Windows download here.