Mine is Strawberry since it has a ton of options and plays a ton of formats. It's also (distant) fork of Amarok 1.4 and integrates well with KDE Plasma. I'm curious what other people are using these days. What's your favorite player?
Foobar2000 has been here for YEAAAARS, and I don't think there is a good enough equivalent for linux, and by that I mean playlist tabs, global shortcuts, etc