cdenc lets you encode whole audio CDs in a special directory which can be burned on CDROM afterwards. It tries to extract all necessary informations for the mp3info tags from the CDDB. It also produces HTML files using wish, including the coverpicture of the disc, tracks.idx files for the sajber jukebox, long filenames for a conventional player, and bitmaps with the cd titles for usage with the Yamakawa/Raite MP3 player AV715. cdenc makes it easy to produce MP3 CDs which work fine with Sajber Jukebox, WinAmp, and Yamakawa the same time.
Chango is a system for cacheing MP3 files from multidisc cdrom drives. Since you can't actually mount different discs in the same physical device simultaneously, this software will cache the files you need off to a predetermined cache, so that all of the needed files will be available simultaneously.
ctrlxmms is a small Perl script designed to increase the useability of XMMS. With it, you can use most of the common GUI functions of XMMS from the CLI. You also have a few handy commands which are not available from the GUI. Together with lirc and a remote (eg. Anir Multimedia Magic), this is a wonderful tool.
DigitalDJ is an SQL-based MP3-player frontend designed for people who want to create an MP3 version of their CD collection. It is designed to work with the Grip ripping/encoding application (but can be used separately). When Grip encodes MP3 files, it will place all of the song information into an SQL database. DigitalDJ can then use this information to create playlists based on a number of criteria.
dmcat is a Digital Music CATalog program. Written in Perl, it recurses a physical directory, searching for digital music files, and builds a virtual catalog (out of symbolic links) in a sister directory. It currently only supports the MP3 format using ID3 tags. The following hierarchies are supported: Album, Artist, Artist_Album, Genre, Miscellaneous (catch-all), Title, and Year.