It's windows only, but there is good news for those waiting for the source code. I made a gcc port with great success. There were couple of things I had to fix, but all in all it went really smooth. Now when it's gcc compatible there is a good chance that it will be more portable than just the native Visual C++ version. gcc is complaining about the Teemu_Gui class initializer list, but it should not cause any bugs. I'm going to go through the source code and look for some things to fix before the source code release.