IRMP3 is a multimedia audio jukebox for Linux. IRMP3's strength is that it easily integrates into home, car, and mobile environments (where a keyboard/screen interface may not always be available). It supports several input and display devices such as infrared remote controls, LCD displays, network connections, and serial keypads. It includes a robust set of tools like alarms, sound environments, mixers, sleep functions, and more. It supports MP3 players and network-ready control & status monitoring, and includes a flexible, modularized source which allows functionality to be easily extended with user-developed code.
Jack is a console based cd-ripper. It supports cdparanoia and cdda2wav (amongst others) for extraction and various MP3 and OGG/Vorbis encoders; you can even rip from a cdrdao-generated CD image. Emphasis is on failure-safeness and ease of use. Jack can encode multiple tracks at once, good on SMP systems. It can resume its work if interrupted and keeps an eye on available HD space. Freedb query is also supported, any time you like, even after encoding. Jack can try to query freedb for MP3s of which you do not know the CD anymore, provided you have a complete rip and know the track sequence.
jMusic provides a library of classes for generating and manipulating music, and is a solid framework for computer assisted composition in Java. jMusic supports composers by providing a music data structure based upon note/sound events, and methods for working with that musical data. jMusic can read and write MIDI files, audio files, and its own .jm files. jMusic is designed to be extendible, encouraging you to build upon the functionality of jMusic by programming in Java to create your own music composition tools.
juked is a daemon that turns a server into a music jukebox. Clients communicate with the server via TCP/IP using an XML protocol. It features playlist support, user authentication (optionally with PAM), and random track selection. Audio decoding is done using XMMS plugins, so both Ogg and MP3 are supported. Track (song) information can be stored internally or in a MySQL database.