TabFloater - Browser extension to use picture-in-picture with any website
VideoJS - VideoJS is an HTML5 Video Player, built with Javascript and CSS, with a fallback to a Flash video...
Video Hub App - The fastest way to browse, search, and manage videos on your computer. Like YouTube for videos on your computer!
Plyr - A simple, accessible and customisable HTML5 media player
riv.yt - A minimalist way to view and share YouTube videos
MediaElement.js - MediaElement.js provides HTML5 audio and video players in pure HTML and CSS.