FreeTube - FreeTube is an open source desktop YouTube player built with privacy in mind.
MediaHuman YouTube to MP3 Converter - Extracts MP3 audio from YouTube, Vimeo, Dailymotion, Mixcloud, Bandcamp, SoundCloud and many others. Available for macOS, Windows and Ubuntu/Linux. FREE!
NewPipe - NewPipe is a lightweight YouTube front-end for Android.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
Minitube - Minitube is a YouTube desktop application.
4k Video Downloader - 4K Video Downloader is a software program that helps people download video files from sites such as Facebook, YouTube and Dailymotion.