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.
OpenAudible - OpenAudible Project Page
DRmare Spotify Music Converter - DRmare Spotify Music Converter is designed to download songs and playlists from Spotify to MP3, FLAC, MAV and other audio formats for playing on any device offline.
AudKit AAX Converter - Full-featured AudKit Audible AAX converter to download and convert Audible audiobooks to MP3, AAC, M4A, M4B, etc. losslessly.
TunePat Spotify Converter - TunePat Spotify Converter is specially designed for converting Spotify songs to MP3/AAC/FLAC/WAV/AIFF/ALAC.
TunesKit iBook Copy for Mac - Easily remove DRM protection from Apple iBooks and copy DRM protected iBooks to DRM free ePub files.