Name : babe
Homepage : https://babe.kde.org/
Reason : babe is a tiny Qt based music player designed to tightly integrate with KDE Plasma, KRunner and KDE Connect using native notifications and because it is kool !
Open Source : Yes (KDE eV / GPL3+)
Current Source : https://download.kde.org/stable/babe/1.2.1/src/babe-1.2.1.tar.xz