BonkEnc is a CD ripper, audio encoder and converter for various formats. It can produce MP3, MP4/M4A, Ogg Vorbis, AAC, Bonk and FLAC files. (GPL)
CDex can extract the data directly (digital) from an Audio CD, which is generally called a CD Ripper or a CDDA utility. (GPL)
MoreAmp is an audio player, transcoder and cd ripper for Mac OS X, OS 9, Windows, Unix, and Linux. (GPL)
Linux - FreeBSD - Windows - MAC OS X
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