Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
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youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
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Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
Onehub - Onehub helps businesses securely share and control files in the cloud.