Ecasound  
   Audio software for Unix.
   http://www.eca.cx/

Linux Music Software Site  
   Free and Shareware programs: screen shots, and user reviews.
   http://www.hitsquad.com/smm/linux/

Matti Koskinen Software  
   Programs including a de-noiser, MIDI generation from fractals, sound creation from gifs.
   http://www.sci.fi/~mjkoskin/

KGuitune  
   A program for tuning guitars and other instruments that is available for download.
   http://www.geocities.com/harpin_floh/kguitune_page.html

Audio File Library  
   An API for accessing a variety of audio file formats.
   http://www.68k.org./~michael/audiofile/

Aumix  
   Adjusts an audio mixer. X and ncurses interfaces.
   http://jpj.net/~trevor/aumix.html

SoundTracker  
   MOD tracker for X, similar to FastTracker. Includes a sample recorder and editor.
   http://www.soundtracker.org/

xmp: Extended Module Player  
   Open source (GNU GPL) portable module player for Unix or Win32.
   http://xmp.sourceforge.net/

GLAME  
   Free and extensible Linux/Unix audio editor. GNU licence.
   http://glame.sourceforge.net/en/index.var

SndStretch  
   Plug-in for XMMS to adjust pitch and tempo of a sound.
   http://www.geocities.com/harpin_floh/sndstretch_page.html

TerminatorX  
   Realtime audio synthesizer allows you to "scratch" on digital audio. Multiple turntables, effects, sequencer.
   http://terminatorx.cx/

Spatializer StreamFX  
   Enhancement software for Linux XMMS Player. 3D stereo, dynamic bass.
   http://www.store.yahoo.com/spatializer-estore/spatstreamfo1.html

Nexus Sound Project  
   Graphical music studio project for Linux (Gtk). Freeware.
   http://nexus.hispalinux.es/en/

AlsaPlayer  
   PCM player written for ALSA driver and library, supports other outputs like OSS and esd. Plug-in interface.
   http://www.alsaplayer.org/

GNOMAD  
   GTK+ client program for the NOMAD Jukebox, using libnjb and id3lib to handle communications and ID3 tagging.
   http://www.df.lth.se/~triad/krad/gnomad/

XMMS-SID SIDplay Plugin  
   Plug-in for playing Commodore 64 music (SID tunes) with XMMS. Requires libSIDPlay library (link given).
   http://www.tnsp.org/xmms-sid.php

Geoff and Dave's Audio Mixer  
   A digital audio mixing package.
   http://gdam.ffem.org/

Sound Processing Kit  
   An object-oriented class library for audio signal processing.
   http://www.music.helsinki.fi/research/spkit

hdrbench  
   This is a benchmark for audio recording under linux using the Alsa drivers.
   http://www.linuxdj.com/hdrbench

Mixxx  
   Open source DJ mixer.
   http://mixxx.sourceforge.net

Orpheus  
   Text and window mode audio player for CDs and MP3 with CDDB interface.
   http://konst.org.ua/orpheus

ZynAddSubFX  
   Synthesizer with two engines, realtime polyphonic, Midi support, microtonal capability, effects.
   http://zynaddsubfx.sourceforge.net

Baudline Signal Analyzer  
   Realtime signal analysis and spectrum analyzer tool.
   http://www.baudline.com

BEAST/BSE  
   GTK+/GNOME based front-end to BSE framework to simulate audio synthesis and tracking composition.
   http://beast.gtk.org

Philip's Music Writer  
   A music typesetter. Input is a plain text file, output is in PostScript.
   http://www.quercite.com/pmw.html

IMMS: Intelligent Multimedia Management System  
   Playlist plug-in for XMMS that tracks the user's listening patterns and dynamically adapts to suit tastes.
   http://www.luminal.org/phpwiki/index.php/IMMS

CoverViewer XMMS Plugin  
   Displays covers or images related to songs. Internet cover retrieval facility. Handles tagged files, CDs, and streams.
   http://coverviewer.sourceforge.net

Dave Phillip's Listings  
   Many categories of Linux audio. Also Dave's editorial musings and picks.
   http://linux-sound.org/

Lilypond  
   Music typesetter. Inputs Mudela files, outputs Postscript sheet music and MIDI files. GNU license.
   http://lilypond.org/web/

Linux Sampler Project  
   Audio sampler with features similar to hardware samplers. Offers speed, high audio quality rates, supports common sample library formats.
   http://www.linuxsampler.org

The TAON Project  
   A sound editor for Linux.
   http://www.informatik.uni-frankfurt.de/~eschenb/taon/

Linux Musician  
   Learn how to setup and compose music on Linux. News, articles, recording guide, FAQ, links.
   http://www.linuxmusician.com

TiMidity++  
   MIDI player, converter to wav. Uses Gravis compatible patches and can play these through soundcards lacking their own patches.
   http://sourceforge.net/projects/timidity/

Dir2ogg  
   Python script that converts MP3 into Ogg.
   http://badcomputer.no-ip.com/linux/dir2ogg/

Zero Tolerance's Cue Creator  
   A small Perl script that allows you to create CUE and MP3/OGG/WAV-files from audio CD's.
   http://www.x-a.be/index.php?page=14

ByteMonkey FLAC2MP3  
   Convert sets of FLAC audio files into the MP3 audio format. Unix, Linux.
   http://www.bytemonkey.org/bytemonkey/html/projects/flac2mp3/

Rosegarden  
   MIDI sequencer and notation editor for Unix-like systems.
   http://www.rosegardenmusic.com/