dvd2mp3 is a Perl script that 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. It is intended to be an easy way to convert convert concert DVDs (as well as other DVDs that have interesting audio tracks) into MP3s.
dvd::rip is a full featured DVD copy program written in Perl. It provides an easy-to-use but feature-rich GTK+ GUI to control almost all aspects of the ripping and transcoding process. It uses the widely known video processing swissknife, transcode, and many other Open Source tools.