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Great Downloader easy to use can convert into multiple file formats. Fast and impressive
FFQueue - FFQueue is a FREE and comprehensive GUI for the FFMpeg command line encoder: Convert audio and video from everything to everything!
Video DownloadHelper - Browser extension to download videos from the Web
WinFF - GUI frontend for FFmpeg.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
SoundConverter - The sound conversion application for the GNOME environment.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.