FreeTube - FreeTube is an open source desktop YouTube player built with privacy in mind.
Video Background Play Fix - Some sites may not work with Firefox for Android video background play feature.
NewPipe - NewPipe is a lightweight YouTube front-end for Android.
YouTube Vanced - Vanced is a modded version of YouTube with many features such as adblocking and background playback
Minitube - Minitube is a YouTube desktop application.
LiteTube - LiteTube is an app that provides HQ video and audio streaming players.