Great Downloader easy to use can convert into multiple file formats. Fast and impressive
YouTube - Our mission is to give everyone a voice and show them the world.
Video DownloadHelper - Browser extension to download videos from the Web
Verystream - Upload and play your media files as fast as your connection lets you!
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.