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

This is a community music site featuring remixes licensed under Creative Commons, where you can listen to, sample, mash-up, or interact with music in whatever way you want.

Soundsnap is the best platform to find and share free sound effects and loops- legally. It is a collection of original sounds made or recorded by its users, and not songs or sound FX found on commercial libraries or sample CD's.

A search engine for copyright free music loops.

Multimedia resources from Katie Wardrobe.

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.

PolyPhontics GB is a software instrument toolbox made specifically for Apple's GarageBand. Sporting some of the same features as its big brother, PolyPhontics, PolyPhontics GB gives you the tools that you need to create software instruments for use in GarageBand compositions.