Audacity is free, open source software for recording and editing sounds. It is available for Mac OS X, Microsoft Windows, GNU/Linux, and other operating systems

Resources and infomration at About.com on digital music and MIDI.

Discussion board for various digital audio software and hardware for Apple's Mac OSX.

A public archive of public domain digital audio files.

Music & Memory is a non-profit organization that brings personalized music into the lives of the elderly or infirm through digital music technology, vastly improving quality of life.