VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
FreeTube - FreeTube is an open source desktop YouTube player built with privacy in mind.
foobar2000 - An advanced freeware audio player for the Windows platform.
NewPipe - NewPipe is a lightweight YouTube front-end for Android.
Winamp - Winamp is a media player that allows users to play multiple-file formats, arrange media in a varied file-management system, and play unique media with AAC encoding.
Minitube - Minitube is a YouTube desktop application.