DeaDBeeF lets you play variety of audio formats, convert between them, customize the UI almost any way you want, and use many additional plugins which can extend it even more.
Set
Simple music player.
Lízatko
Lollypop is a new GNOME music playing application.
Deepin Music
It is an awesome music player with brilliant and tweakful UI Deepin-UI based.
Kantáta
A simple music player.