AIMP [Windows/Android] has been my Winamp replacement for ~15 years. I’ve never found a player that comes close to rivalling it.
P.S. I have no idea what the licence is for AIMP, I just know it’s free and is excellent. You don’t need Winamp.
What about jet audio? Is it FOSS? I can’t find anything about that. I used it after Winamp started disappointing with it’s media support.
I’ve been using it on Android because of its seamlessly crossfade feature (i.e. the next music/replay gets faded in as the current music is approaching the end). I made some loops with Audacity and it’s the only music player that manages to play them endlessly with no gaps.