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Not open source, but it’s the closest I have come to Winamp. It’s really good!

It's quite beautiful, thanks for the suggestion! Unfortunately, seems to not support FLAC's cue files for track lists, which is quite a bummer.

re:AMP seems like a pretty good clone that supports skins and everything. Up to you if you want to trust it or not.

It’s the most true WinAmp for Mac I’ve ever found.