JNapster is a Napster client implemented in Java. It allows you to download MP3s over the Internet. It provides a GUI similar to that of the Napster Windows client and has some handy features the original doesn't have: It gets server lists directly from napigator.com and logs you into as many Napster servers as you want, which you can query in parallel.
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.
Libmmoss enables the Linux version of Netscape Navigator/Communicator to play sounds from Java applets. It is a replacement for Netscape's implementation of (the Java class) sun.audio.AudioDevice (including some JRI native C code). It should work with either the OSS or ALSA sound drivers. The latest version will also work with EsounD.
Protux is being developed to be a complete Digital Media Production tool, or Digital Media Workstation. The focus is on GNU/Linux users, but it runs in any workstation with a Java >=1.5 VM installed, and even over the Web through a standard browser that supports Java. It aims to offer an integrated environment for audio, video, and MIDI production throught a innovative interface where the productivity is focused.
webCDwriter can be used to make the CD- and DVD-writer(s) connected to a Linux box available to all users in your network. It consists of the server CDWserver and the clients webCDcreator and rcdrecord. CDWserver stores the files transmitted by the clients, reserves the CD-writer and controls the CD-writer using cdrecord. webCDcreator is a Java applet that runs within your browser or by Java Web Start, assists you when putting together a CD, and transmits the files. Finally rcdrecord is a command line client that tries to offer the functionality of cdrecord over the network with full multi-user support.
Webplay creates, from a collection of MP3s and Ogg Vorbis files (indexed from a directory or MySQL/PostgreSQL database), a Web-based jukebox with support for multiple independent streams. If Lame/oggenc are available, it can change the bitrate or codec of a file in real time to a selectable value. Each user controls their stream via a Web interface and can skip back, forward, or to a specific track; increment or decrement the bitrate; and check the current playlist, song, or bitrate. Playlists can be looped, randomized, played locally on the webserver, edited, deleted, reused, or renamed.