Winamp "opened" its source up. https://image.nostr.build/6506274f8b7c86bf82750c863886ea80b763fd817dd38bc805dbf5065b387f1c.jpg https://github.com/WinampDesktop/winamp
We've always had open source WinAmp. There are two. Audacious and XMMS. Both available in Linux
If I remember right though, those will run the classic skins, but not modern ones. I got it running okay-ish using Wine, but I could never get the visualizations running.
Probably. I liked Amarok better back in those days, so didn't use XMMS or Audacious much.