Apprentice Alf's DeDRM Tools - Everything you ever wanted to know about DRM and ebooks, but were afraid to ask.
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
DRMBuster - DRMBuster is a powerful all-in-one audio and video conversion software for any kind of purchased or legally obtained music and video.
AIMP - AIMP : Free Audio Player : Официальный сайт программы
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.
foobar2000 - An advanced freeware audio player for the Windows platform.