Great Downloader easy to use can convert into multiple file formats. Fast and impressive
yt-dlp - A youtube-dl fork with additional features and fixes.
Video DownloadHelper - Browser extension to download videos from the Web
ytbtomp4 - Ytbtomp4 is a free and safe YouTube downloader helping users convert YouTube videos to MP4 and MP3. Easy to use.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
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.