NewPipe - NewPipe is a lightweight YouTube front-end for Android.
4k Video Downloader - 4K Video Downloader is a software program that helps people download video files from sites such as Facebook, YouTube and Dailymotion.
Minitube - Minitube is a YouTube desktop application.
Video DownloadHelper - Browser extension to download videos from the Web
FreeTube - FreeTube is an open source desktop YouTube player built with privacy in mind.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.