CD
Players
dcd : non interactive command line cd player | man | readme | documentation
cdcd : interactive console based cd player | man | readme | documentation
xfreecd : light GUI cd player | man | readme | documentation
Rippers
cdparanoia : command line audio extraction tool | man | documentation
jack : command line ripper/encoder tool | man | readme | documentation
grip : GUI CD-player/ripper/encoder | man | readme | documentation
ripperx : GUI ripper/encoder | man | readme | documentation
Burner
gcombust : GUI CD mastering and burning program | man | readme | documentation
k3b : CD and DVD burning application | documentation
cdrecord : command line CD burning tool | man | readme | documentation
mp3burn : burns audio CDs directly from MP3, Ogg Vorbis, or FLAC files | man | readme | documentation

Compression
Encoder
flac : Free Lossless Audio Codec - command line tools | man | readme | documentation
mp32ogg : converts MP3 file to Ogg Vorbis | man | documentation
toolame : MPEG-1 layer 2 audio encoder | man | readme | documentation
oggenc : command line tools to convert audio in Ogg Vorbis format | man | documentation
Decoder
faad : | man | documentation
madplay : ISO AAC audio decoder | man | documentation
Tools
cantus : GUI tool to mass-rename/tag mp3 and ogg files | man | readme | documentation
id3 : id3 Tag Editor (mp3 tag) | man | readme | documentation
id3v2 : id3v2 tag editor (mp3 tag) | man | readme | documentation
ogginfo : displays ogg information | man | documentation
vcut : ogg file splitter | man | documentation
vorbiscomment : ogg comment editor | man | documentation
vorbisgain : add suggested volume level for .ogg files as .ogg comment | man | readme | documentation

Djing
Scratching
terminatorx : digital scratcher | documentation
Mixing
dbmix : DJ mixer for digital audio streams | man | readme | documentation
Jukebox
musiclibrarian : GUI that tool that organize collections of music | man | readme | documentation
pytone : text-mode jukebox | man | readme | documentation
gjay : an automatic and learning DJ for xmms | man | readme | documentation
moosic : command line jukebox system | man | readme | documentation

Drumming
hydrogen : drum machine/step sequencer | man | readme | documentation
tk707 : drum sequencer for a sound card or MIDI device | man | documentation

DSP
Salto : saxophon and trumpet synthesizer based on the CLAM library | man | documentation
SMSTools : spectral processing editor based on the CLAM library | man | documentation
creox : real-time guitar effects | man | readme | documentation
freqtweak : realtime audio frequency spectral manipulation | man | readme | documentation
jack-rack : a a LADSPA effects rack | man | readme | documentation
jackeq : routes and manipulates audio from/to multiple sources | man | readme | documentation
jamin : JACK Audio Mastering interface | man | readme | documentation
mammut : FFT analysing and resynthesis application for sound files | man | documentation
tapiir : multitape delay with realtime I/O | man | documentation
brutefir : a software convolution engine | man | readme | documentation
normalize : adjusts volume levels of audio files | man | readme | documentation
LADSPA
blop : bandlimited wavetable-based oscillator plugins | man | readme | documentation
cmt : Computer Music Toolkit (cmt) a collection of LADSPA plugins | man | readme | documentation
ladpsa-sdk : sample tools for linux-audio-dev plugin architecture | man | documentation
mcp-plugins : plugins designed for Alsa Modular Synth | man | readme | documentation
swh-plugins : Steve Harris's plugins | man | documentation
tap-plugins : Tom's Audio Processing plugins | man | documentation

Editors
Audio
audacity : Graphical audio editor | man | documentation
ceres3 : spectral domain editor for audio files | man | documentation
ecawave : audio file editor based on Qt and ecasound libraries | man | readme | documentation
glame : versatile audio editor | man | readme | documentation
rezound : sound file editor | man | readme | documentation
snd : sound file editor | man | documentation
sweep : sound wave editor | man | readme | documentation
wavesurfer : sound file editor | man | documentation
xsox : an X interface for sox | man | readme | documentation
Mod
cheesetracker : sound module tracking program | man | readme | documentation
soundtracker : sound module editor/player | man | readme | documentation
Tabs
etktab : ASCII guitar tab editor | man | documentation
songwrite : guitar tablature editor and player | man | readme | documentation
Score
denemo : a gtk+ frontend to GNU Lilypond | man | readme | documentation
noteedit : KDE Music Editor | man | readme | documentation
Soundfont
smurf : A SoundFont editor for Linux | man | readme | documentation

Jack
jackd : JACK Audio Connection Kit | man | readme | documentation
qjackctl : user interface for controlling the JACK sound server | man | readme | documentation
jack.plumbing : jack.plumbing - JACK Plumbing Daemon | man | documentation
jack.play : JACK Sound File Player | man | documentation
jack.udp : JACK UDP Transport Client | man | documentation
jack.ctl : JACK Session Manager | man | documentation
jack.scope : JACK Oscilloscope | man | documentation
jack.clock : JACK Transport Publication Daemon | man | documentation
meterbridge : A collection of audio meters for the JACK | man | readme | documentation

Midi
Patch bay
aconnectgui : graphical ALSA sequencer connection manager | man | readme | documentation
alsa-patch-bay : graphical patch bay for the ALSA MIDI system | man | readme | documentation
Player
pmidi : A command line midi player for ALSA | man | readme | documentation
timidity : Software-only MIDI sequencer | man | readme | documentation
timidity-el : An Emacs front end to the timidity software | man | documentation
Sequencers
muse : Qt-based midi/audio sequencer | man | readme | documentation
rosegarden4 : music Editor and MIDI/Audio Sequencer | man | readme | documentation
Keyboard
vkeybd : virtual keyboard program | man | readme | documentation

Miscellania
gkrellmms : GKrellM XMMS Plugin | man | readme | documentation
gtick : Metronome application | man | readme | documentation
ladcca-bin : LADCCA example clients | man | documentation
rtmix : interactive multimedia art performance, composition interface | man | readme | documentation

Mixers
alsamixergui : graphical soundcard mixer for ALSA soundcard | man | readme | documentation
gamix : Graphical sound mixer for ALSA | man | readme | documentation
alsamixer : soundcard mixer for ALSA soundcard driver, with ncurses interface | man | readme | documentation

Recorder
Multitrack
ardour : digital audio workstation | man | readme | documentation
ecasound2.2 : Multitrack-capable audio recorder and effect | man | readme | documentation
protux : multitrack digital audio suite | man | readme | documentation
tkeca : GUI for Ecasound | man | documentation
Simple
krecord : KDE sound recorder | man | readme | documentation
qarecord : simple stereo recording tool. | man | documentation
timemachine : JACK audio recorder for spontaneous and conservatory use | man | documentation

Notation
abcmidi : A converter from ABC to MIDI format and back | man | documentation
abcmidi-yaps : ABC to PostScript converter | man | documentation
lilypond : a program for printing sheet music | man | documentation

Player
Console
mpg321 : A Free command-line mp3 player, compatible w | man | readme | documentation
cplay : A front-end for various audio players | man | readme | documentation
music123 : A command-line shell for sound-file players | man | readme | documentation
vux : A rating-based, random ogg and mp3 player | man | documentation
GUI
alsaplayer : PCM player designed for ALSA | man | documentation
xmms : Versatile X audio player that looks | man | readme | documentation
zinf : Extensible, cross-platform audio player | man | readme | documentation
Mod
mikmod : Portable tracked music player | man | readme | documentation
xmp : A module player | man | readme | documentation

Radio
gkrellm-radio : FM radio tuner for GKrellM | man | readme | documentation
gradio : GTK FM radio tuner. | man | readme | documentation
radio : console radio application | man | documentation

Streaming
darkice : live audio streamer | man | readme | documentation
icecast2 : Ogg Vorbis and MP3 streaming media server | man | readme | documentation
ices2 : Ogg Vorbis streaming source for Icecast 2 | man | documentation

Synthesis
amsynth : two oscillator software synthesizer | man | readme | documentation
bristol : Vintage Synthesiser emulator | man | documentation
fluidsynth : Real-time MIDI software synthesizer fluidsynth | man | readme | documentation
qsynth : fluidsynth GUI front-end based on qt3 libraries | man | documentation
ams : a realtime modular synthesizer for ALSA | man | readme | documentation
beast : music synthesis and composition framework | man | readme | documentation
galan : modular audio processing and synthesis system | man | readme | documentation
cecilia : graphic user interface for CSound | man | readme | documentation
csound : powerful and versatile sound synthesis software | man | documentation
jmax : A visual environment for interactive music and video | man | readme | documentation
nyquist : A computer programming language for software sound synthesis and music composition | man | documentation
puredata : realtime computer music and graphics system | man | documentation
pd-externals : PD external collection (aenv~, ann, arraysize, beatpipe, build, chaos, creb, CVS, cxc, debian, dfx, ext13, ff, footils, forward, ggee, grill, hcs, jackx, list, markex, maxlib, miXed, motex, OSCx, pdogg, plugin~, pso, rhythm_estimator, sprinkler, susloop~, svf~, tbext, tmp, vbap, vst, zexy, zhzxh~, ) | man | documentation
rtcmix : sound-processing, synthesizing, modification | man | readme | documentation
sfront : MPEG 4 Structured Audio decoder. | man | readme | documentation
spiralsynthmodular : A virtual modular synthesizer and seqencer | man | readme | documentation
supercollider : realtime sound synthesis server and network | man | documentation
zynaddsubfx : Realtime software synthesizer for Linux | man | documentation

Video
soma : video and audio manipulation tool | man | documentation
blender : a 3D modelling and rendering package | man | documentation
cinepaint : | man | documentation
GEM : Graphics Environment for Multimedia | documentation
gephex : modular video jockey software | man | documentation
hasciicam : ascii video streamer | man | documentation
kino : non-linear editing of digital video data | man | documentation

System
libjackasyn0 : The Asynchrounous JACK Library | man | documentation
laddcad : Session manager | man | documentation