ID3Tags:

Martin Nilsson
http://www.id3.org/

Diek Mahoney
http://www.id3lib.org/

CD-Datenbank:

CDDB Inc
http://www.cddb.com/

Musik & Software: mp3.com
http://www.mp3.com/

Ripper:

Audio Catalyst
http://www.xingtech.com/mp3/audiocatalyst

HyCD Play&Record
http://www.hycd.com