Max/MSP + Jitter

Bonk3~ - This is an updated version of Bonk~, which detects attacks in an audio signal. This version is much more configurable, includes training for multiple instruments, and should give better performance. Also included is the makefile for pd.
Provided under a BSD license.
[.zip File]

Max Raw Filter Pack - A collection of raw filters, ported from pd, that provide components for the construction of more complex filters.
Provided under a BSD license.
[.zip File]

slitscan - Patches to do slit-scanning for CPU and GPU in Jitter
[.zip File]

clipboard - A Max/MSP External that outputs text from the OS X clipboard.
[.zip File]

sms - A Max/MSP External that receives input from the Sudden Motion Sensor on Apple Portables.
[.zip File]

tcpconnect - A Max Java External that creates a continuous connection to a TCP server.
[.zip File]

MaxObjects.com Firefox Extension - Install this extension to search MaxObjects.com directly from the Firefox toolbar.
[Firefox Search Extension]

SuperCollider

Random Number Distributions - A SuperCollider class that implements several standard pseudo-random number generators. Currently available are Gaussian, LaPlacian, Poisson, Gamma, Chisquare, Cauchy, and Weibull.
[.sc File]

Other

Midi2Freq - A small OS X app that converts midi note numbers to frequency values.
[.DMG : Source Code]

OscGroupsX - A OS X client and server package for sending and receiving Open Sound Control messages over a network. Messaging groups are created whose members communicate via OSC. Based on the original OscGroups by Ross Bencina.
[.DMG : Source Code]