VideoJS - VideoJS is an HTML5 Video Player, built with Javascript and CSS, with a fallback to a Flash video...
Softorino YouTube Converter - Download YouTube video & audio. Watch and listen offline
Plyr - A simple, accessible and customisable HTML5 media player
Yout - YouTube to Mp3 Converter
Flowplayer - Flowplayer is a video player for web sites.
You-Get - Command-line utility to download media contents from the web