Apprentice Alf's DeDRM Tools - Everything you ever wanted to know about DRM and ebooks, but were afraid to ask.

FLAC - A free, open source codec for lossless audio compression and decompression

DRMBuster - DRMBuster is a powerful all-in-one audio and video conversion software for any kind of purchased or legally obtained music and video.

Opus Interactive Audio Codec - Opus is a totally open, royalty-free, highly versatile audio codec.

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.

Vorbis - Ogg Vorbis is a fully open, general-purpose compressed audio format for mid to high quality...