FacePause - Look away to pause YouTube videos
Lark Player - Lark Player – YouTube Music & Free MP3 Top Player is a fine tool developed by Mobiuspace Tech Top Player.
CornerTube - Watch YouTube in picture-in-picture on iPad
Musicolet - Musicolet is a small yet feature-rich offline Music Player for Android.
Video Hub App - The fastest way to browse, search, and manage videos on your computer. Like YouTube for videos on your computer!
Audiomack - The free SoundCloud alternative