The Freesound Project is a collaborative database of Creative Commons licensed sounds.

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.

mp3cut is service that allows you to cut mp3 files on-line. From now on you don't need difficult programs to cut and create a melody for your cell-phone. Three simple actions and your melody is ready!

Soundation Studio has all the functionality of a professional desktop DAW including real time effects, virtual instruments, automation, recording and much more! And best of all - It’s online, accessible through your browser.