Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
Sidify Apple Music Converter - Sidify Apple Music Converter is a popular tool used to convert Apple Music, iTunes M4P music and audiobooks to MP3/AAC/WAV/FLAC/AIFF/ALAC. It keeps lossless audio quality and ID3 tags after conversion.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
OpenAudible - OpenAudible Project Page
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
TuneFab Apple Music Converter - TuneFab Apple Music Converter enables you to convert Apple Music, iTunes music and audiobooks to MP3/AAC/WMV without DRM protection.