Basically, it's a Wine wrapper with QoL features that eases the installation process of Apple's GPTK (via their homebrew tap)
Cooked up in about 2 minutes with IconKitchen. I'm a software engineer, not a graphic designer.
If you are in need of something stronger, get Whisky. This is just the bare minimum to get GPTK working
Harbor has not quite aged enough yet, but if sailing the high seas is your jam, start your journey
Have fun and report bugs!