YouTube Messenger - YouTube in-app video sharing and messaging

Mopidy - Mopidy is an extensible music server written in Python. Mopidy plays music from local disk, Spotify, SoundCloud, Google Play Music, and more. You edit the playlist from any phone, tablet, or computer using a range of MPD and web clients.

Kiwi Music Player - Listen to any track on youtube on this Mac App

mpc - A minimalist command line interface to MPD.

YouTube Vanced - Vanced is a modded version of YouTube with many features such as adblocking and background playback

VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.