The only software I truly missed from the Windows world was foobar2k. I was absolutely shocked (in a happy way) to see someone has attempted to port it to the Mac.
I am not shocked (in a low-key way) to see that it’s nowhere near close to being a finished article. ReplayGain, DSP, and connecting to an FTP server seem to work. But otherwise, there’s no scrobbling, no folder views, no album art displays, etc. It doesn’t fit my needs yet but it is definitely coming together in a good way.