Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Wallcat - Enjoy a new, beautiful wallpaper, every day.
AIMP - AIMP : Free Audio Player : Официальный сайт программы
Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.
foobar2000 - An advanced freeware audio player for the Windows platform.