Great Downloader easy to use can convert into multiple file formats. Fast and impressive
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Video DownloadHelper - Browser extension to download videos from the Web
KDE Connect - Integrate Android with the KDE Desktop
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Monect - Make the best use of sensors on smart device to control PC, simulate steering wheel, game-pad...
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.