Frinika
- Cross-platform music studio software written in Java. Includes sequencer, software synths and realtime effects.
- http://www.frinika.com

FreeMusicPlayer
- Part Java part native, supports MP3, WAV, Ogg, and playlists. Windows 2000/XP.
- http://patriot.net/~gary/FreeMusicPlayer.html

RPitch
- Relative pitch ear training to recognize intervals. Freeware.
- http://rpitch.sourceforge.net

JFugue
- API for specifying music using simple strings and easily transforming patterns of music.
- http://www.jfugue.org

Neuralsemantics Modulator Jane
- Applet uses standard AU sound files to modulate graphics on web page. Also offers Neurosonic e-Guitar.
- http://neuralsemantics.com/mjane/mjprod.html

FreeTTS Speech Synthesizer
- Written in Java, based upon Flite 1.1: a run-time speech synthesis engine from Carnegie Mellon. Open source, BSD.
- http://freetts.sourceforge.net/docs/index.php

jOggPlayer
- Gui Enhanced Vorbis Ogg Player. Freeware.
- http://joggplayer.webarts.bc.ca/

JavaTuner
- Tunings and temperaments. Demo applet.
- http://pages.globetrotter.net/roule/accord.htm

JavaZoom
- Java MP3 Player supports WAV, AU, AIFF, Ogg Vorbis also.
- http://www.javazoom.net/

SoftSynth.com
- Music and synthesis software API, including JSyn and JavaSonics ListenUp.
- http://www.softsynth.com/