SharewareMusic

Editor of MPLAY, a MP3, MIDI-Files and Movie files player.

Makes Max Magic Microtuner, a Macintosh application (OS X and OS 9 Carbon) for creating and editing microtonal scales and keyboard mappings. You can import, edit and export 128-note MIDI Tuning Standard keymap files (.syx, .mid) compatible with the Native Instruments FM7 softsynth and with all hardware and software synthesizers supporting the MTS format; you can also import and export native Scala (.scl) microtuning files, and Native Instruments Pro-52/Pro-53 microtuning files (.p5m, export-only).

AudioNerdz makes Delay Lama, the Virtual Singing Monk, a freeware VST-instrument.

This PowerPC program reads music directly from your CD-ROM drive and slows it down between 1% and 400% using a "time-stretching" method which does not change the pitch, regardless of the speed! Most programs of this sort require you to record the music first. Not with the Amazing Slow Downer. It processes the music in real time - just insert the CD and press the play button! You may also play MP3, AIFF and Wave files.

Shareware and freeware plug-ins for ProTools

Makes MetroGnome, a highly customizable freeware metronome for OS X (Cocoa)

Makes audio software

CSound Applications for Macintosh by Matt Ingalls

??? a universal MIDI librarian. SysEx can transmit and receive system exclusive (sysex) messages via MIDI and can save and load these messages to and from disk. It features a 256K receive buffer, a "continuous receive" mode (allowing multiple sysex messages to be combined in a single file), and special features to support KORG Wavestations and the Roland D-5/10/20/110 series.

Saitara Software offers audio software for iPhone and iPad.

Illposed Software is a distributed collective of programmers focused on multimedia applications and dedicated to applying 'pataphysical insights and methodologies to the practice of software development.

VST Plugins

Jean-Louis Valero makes LoopyLoop, a shareware multimedia reader.

Software by Daniel Wedjesjö for music production and sound design

Cecilia is a graphic user interface for the sound synthesis software csound. There are now MacOS X installer packages for it.