I have searched for hours and come up with nothing. Others say that you won't find any mac-specific mods because most are cross compatible, but I have no idea how to install them. I tried making one, copying it directly to the Data directory, but nothing worked.
Some people who have it on both windows and mac seem to think that it has the same folders, etc., but I have not been able to find any kind of mod folder.
I have been looking all night, forever, and here is what I have come up with: