Sidify Music Converter - Sidify Music Converter for Spotify is a popular tool used to convert Spotify music to MP3/AAC/WAV/FLAC/AIFF/ALAC. It keeps original audio quality and ID3 tags after conversion.
DRMBuster - DRMBuster is a powerful all-in-one audio and video conversion software for any kind of purchased or legally obtained music and video.
Apprentice Alf's DeDRM Tools - Everything you ever wanted to know about DRM and ebooks, but were afraid to ask.
TunesKit Spotify Converter - TunesKit Spotify Music Converter for Windows is a fastest music converter for Spotify to convert any Spotify song, album and playlist to common MP3, AAC, M4A for playback on any popular player.
Transcoder Audio Edition - Audio converter for Linux, Audio transcoder for Linux
AudFree Auditior - AudFree Auditior is a sumptuous tool that is used to convert Audible books, iTunes songs, and Apple Music.