A commercially available, easy to use sample player for MacOS X.
See my Research Page for my software for multiresolution rhythm analysis and interpretation.
There are several software projects I have started, maintain and/or contribute to, hosted on SourceForge.net. These include:
A library for matrix and array processing and plotting in Common Lisp. Effectively it makes Common Lisp as easy to crunch data as Matlab.
Originally by David Jaffe and Julius Smith, a DSP based object-oriented music library which integrates DSP, MIDI and software synthesis paradigms to OpenStep/MacOS X/Windows/Linux (GnuStep).
William Clocksin's Calliope music notation package from NeXTStep to MacOS X and GNUstep.
A collection of matrix, vector, DSP, statistics and other mathematical operations as an Objective C framework for use on MacOS X/OpenStep/GnuStep.
While I didn't write these utilities, it seems I'm the last person who has these, so I've kept my page for download.