Command line utilities for verifying, tagging, converting, and burning lossless audio files (e.g. SHN, FLAC) and also provides conversion to MP3/OGG.
DVD2MP3 is a perl script which converts audio tracks on a DVD into id3 tagged mp3 files. It was written for Linux, though it could probably be used on other Unixes with little trouble. It requires mplayer, lame, lsdvd, MP3::Tag and Term::ReadLine.
Cretin is a highly customizable tool for the ripping, encoding and tagging of CD's. Cretin supports distributed and delayed encoding with multiple encoders, and is tailored to take advantage of multiprocessing environments.
highly networkable system for creating mp3s. Designed so you can run your ripping process on one (or more) machine, the encoding on some others and having the final storage on yet another box. CDDB support and maintainable code(!) are standard features.