reEmbed - Custom YouTube Video Player
VideoJS - VideoJS is an HTML5 Video Player, built with Javascript and CSS, with a fallback to a Flash video...
TabFloater - Browser extension to use picture-in-picture with any website
JW Player - JW Player is an embeddable media player.
mps-youtube - Terminal based YouTube player and downloader
Plyr - A simple, accessible and customisable HTML5 media player