Mac OS

Apple - GarageBand
Perform, record and create music from virtual instruments and pre-recorded loops.
http://www.apple.com/ilife/garageband/

Apple - iTunes
Audio player with multiple playlist functions, native burn support, visual effects, and file conversion.
http://www.apple.com/itunes/

Apple - Soundtrack Pro
Audio sequencer designed for video, DVD, and web projects. Includes instrument loops and sound effects.
http://www.apple.com/finalcutstudio/soundtrackpro/

Apple Quicktime
Apple's free media player supporting innumerable audio and video formats. The pro version includes an abundance of media authoring capabilities.
http://www.apple.com/quicktime/

Ask the DJ
MP3 player and DJ/mix engine with beats analysis.
http://www.wildbits.com/askthedj/

Audiocorder
VOX program audio recorder. Can set volume sound must reach to begin recording and volume at which it should stop.
http://www.blackcatsystems.com/software/audiocorder.html

Audiomac
Reviews of hard disk recording and digital audio post-production software.
http://www.euro.net/ecompany/

Audion
Audio player for MP3 files, CDs, and streaming audio from the Internet. Skins/faces available.
http://www.panic.com/audion/

Autoscore
Audio-to-MIDI music program that allows you to compose by simply singing or playing an instrument.
http://www.wildcat.com/

Barbabatch
Institutes a Quicktime 4.0 codec that converts MP3 files. Demo download available.
http://www.audioease.com/Pages/Barbabatch/BarbaMain.html

BIAS Inc.
Peak Studio for editing, processing, and mastering. Deck, a DAW. Vbox for multi-effects. Freq, a 4-Band EQ.
http://www.bias-inc.com/

Bitcartel Software
Developers of iRecordMusic and RadioLover, utilities to record audio streams to AAC and MP3.
http://www.bitcartel.com/

Cacophony
Digital audio editor for OS X. Supports many different file formats and multi-track editing.
http://www.bannister.org/software/cacophony.htm

CMN Common Music Notation
Free western music notation package written in Common Lisp.
http://www-ccrma.stanford.edu/software/cmn/

Cosmetic
Rhythm sequencer, sampler, synthesizer.
http://cosmetic.yowstar.com/

Demystifying the iTunes EQ
Article giving advice about using the EQ setting in iTunes to its full potential.
http://www.methodshop.com/mp3/articles/ituneseq/

djay
Music player and DJ software with iTunes integration, recording, real-time collaborative mixing and support for multi-touch trackpads.
http://www.djay-software.com

DSP-Quattro
Professional sound editor.
http://www.i3net.it/Products/dspQuattro/Asp/Index_EN.asp

Emagic
Featuring the Logic series, several virtual instruments and hardware accessories. Products description, support area, company information and news.
http://www.emagic.de/

Extended iTunes Rating
Analysis of how iTunes deals with ratings of a finer gradient than just the number of stars.
http://www.omninerd.com/2006/02/10/articles/47

Felt Tip's Sound Studio
Shareware digital audio editing and recording application.
http://felttip.com/products/soundstudio/

FingaMIDI
Replacement open-source driver that allows a PowerBook or iBook trackpad to be used as a 3-axis MIDI control surface.
http://fingamidi.sourceforge.net/

fLOW Ambient Sound
Generates a changing soundscape in realtime suggestive of timbres of water, fire, earth, and air. Freeware for Mac G3.
http://www.essl.at/works/flow/download.html

FXpansion
Creators of BFD drum library module, DR-008 drum sampler, as well as VST to RTAS, VST to Rewire, and VST to AU plug-in adaptors.
http://fxpansion.com

The GarageDoor
Tips and suggestions for Apple's GarageBand. Covers live and MIDI recordings, effects, mixing, mastering and links to free loops.
http://www.thegaragedoor.com/

Girl Audio Loop Mixing Software
MIDI-enabled audio loop mixing instrument.
http://girl.yowstar.com/

Granted Software
Developers of the AudioUnit host Rax, AudioUnit Manager, and ReVision, a tool to sunchsonize audio from Propellerhead Software's Reason or Ableton's Live with QuickTime movies. All are exclusively Mac OS X applications.
http://www.grantedsw.com/

GregEdit
Software for editing and listening to Gregorian Chant.
http://gregorian.soft.free.fr/

How Much Does iTunes Like My Five-Star Songs?
Article explores the algorithm iTunes uses to pick what comes next in a Party Shuffle playlist.
http://www.omninerd.com/2005/08/25/articles/34

iDrum
Drum machine for OS X, running as both a standalone application and as plug-in. Overview, screenshots, features, downloadable demo and purchasing information.
http://glaresoft.com/products/idrum/index.html

Intuem
MIDI music authoring solution for OS X with Aqua interface, music notation, intended mostly for musical amateurs.
http://www.intuem.com/

iPod Free File Sync
Utility for Mac OS 9 which allows synchronization of music from different iPods or any other source to computer.
http://www.crispsofties.com/ipodfreefilesync/

iStream
MP3 Streaming Server for the Macintosh from Arctic Software.
http://www.arcticsw.com/istream/

3ivx.com
A natural video compression system that is compliant with MPEG-4v3.
http://www.3ivx.com/

Jasmine Audio
Stereo multi-track audio editor and converter supporting AAC/MP4, AVI, System 7, AIFF, WAV, Quicktime, and other formats.
http://www.jasmineaudio.com

Lexikon Sonate
Generates piano music in realtime, can also be used as a meta-instrument for improvising complex piano music.
http://www.essl.at/works/Lexikon-Sonate.html

Lime
Music Notation software for Macintosh. Also available for Win32. (CERL Sound Group)
http://www.cerlsoundgroup.org/cgi-bin/Lime/Mac.html

Macintosh Music Software Site
Many freeware and shareware applications available for download.
http://www.hitsquad.com/smm/mac/

MacWaveMaker Users Group
MacWaveMaker is a nubus card midi synthesizer for Macintosh. Claims every MacWaveMaker thing may be found here.
http://members.tripod.com/~proclus/mw.html

Make A TestTone
Free Macintosh test tone Generator
http://www.audioease.com/Pages/Free/MATTMain.html

Max Magic Microtuner
Microtonal scale editor.
http://groups.yahoo.com/group/16tone

MetroGnome
Freeware metronome for OS X. Customizable settings.
http://www.braxtech.com/metrognome/

Microsoft Media Player 7.1
Support among others Microsoft MPEG-4 (version 2.0 and 3.0)and the ISO MPEG-4 video (version 1.0) video codecs.
http://www.microsoft.com/windows/windowsmedia/player/mac/mp71/

MRAC Publishing - Symbolic Composer
Programming language/expert system for MIDI music composition, including the VLISP Lisp Visualization System.
http://mracpublishing.eu/

Music Ace
Two education programs covering music concepts.
http://www.harmonicvision.com/products.htm

OS X Audio
Forum provinding information for OS X users.
http://www.bigbluelounge.com/

Ovolab
Develops applications for Mac OS X, particularly software that converts MP3 songs to AAC format. Includes support and downloads.
http://www.ovolab.com

PlayerPRO
Tracker, composer, and player, all in one.
http://www.quadmation.com/pphome.htm

QDesign
Audio compression solutions for digital music, new media, and Internet streaming.
http://www.qdesign.com/

Red Barn Goat Farm
Li'l Miss' Scale Oven (LMSO), an ethnic and microtonal scale editor/synth retuner. Also DSP holophonics plug-ins.
http://www.nonoctave.com/

RhapsOGL visual effects
RhapsOGLApp X visual effects generator for MacOSX - This is a visual plug-in for SoundJam MP and MACAST
http://webrhapso.free.fr/rhapsogl/plug.shtml

Rocket Science
Bundle of real-time plugins for Mark of the Unicorn's Digital Performer and Audio Desk.
http://www.audioease.com/Pages/RocketScience/RocketMain.html

Roxio's Jam Software
Sound editing software for Macintosh allowing users to easily create 100% Red Book compliant audio CDs.
http://www.roxio.com/en/products/toastwithjam/index.jhtml

Sagan Technology Metro
Sequencer with MIDI, audio, and video functionalities. Includes support for CoreAudio, CoreMIDI, Audio Units, Music Devices, Music Effects, VST, and Premiere.
http://www.sagantech.biz/

SimpleChord
Handy reference to chords for musicians. For Mac OS X.
http://www.wonderwarp.com/simplechord/

Sound Grinder
Batch audio conversion application with support for a variety of formats, along with the retention of metadata for .mp3, Ogg Vorbis, FLAC, and Quicktime files.
http://www.monkey-tools.com/soundgrinder/

SoundConverter
Batch audio converter supporting innumerable sample-based and note-based file formats
http://www.dekorte.com/projects/shareware/SoundConverter/

SoundHack
Shareware sound processing program does various conversions including sample rate, changes file headers, plays headerless files.
http://www.soundhack.com/

Soundminer
Audio file management system for Digital Audio workstation networks having a Mac attached.
http://www.soundminer.com/

Spectrasonics Virtual Instruments
Creators of Atmosphere, Stylus, and Trilogy virtual instruments/plug-ins, each with vast core libraries.
http://www.spectrasonics.net

Syd - Software Synthesizer
A software synthesizer for Mac and Windows. Similar to CSound in capabilities, but easier to use.
http://www.jbum.com/syd/

Talking Panda - iLingo
Language translator for iPod.
http://talkingpanda.com/

thOnk_0+2
Freeware application uses Granular Synthesis to produce very diverse sounds based on a user provided sound file.
http://www.audioease.com/Pages/Free/FreeMain.html

TunesTracker
Search the iTunes Music Store daily for your favorite artists and send you an e-mail when there are new songs by those artists.
http://www.tunestracker.com

U and I Software
Developers of MetaSynth, a composition and sound design program using a strictly visual interface, with customizable tunings and image synthesis.
http://www.uisoftware.com/PAGES/acceuil_meta.html

USB-Audio.com
USB Audio software for Macintosh.
http://www.usb-audio.com/

Virtual Composer
Shareware multiple track graphical sequencer, allowing files to be exported in AIFF, abc, or MIDI formats.
http://users.forthnet.gr/ath/jgal/programming/composer.html

YamIpod - Yet Another iPod Manager
Freeware application enabling adding and deleting music from the device. Includes software news, development information, and downloads.
http://www.yamipod.com/