Audio Sources

Freesound

by OH
 From http://www.kk.org/cooltools/:

There are sound effects libraries that cost more than a small car, and they’re probably worth it to certain kinds of users — like movie studios or audio production houses — but not to me. In search of interesting, appropriately licensed sounds for personal amusement, some google searching led me to Freesound.org, which has many thousands of freely usable, user-contributed sound recordings, all Creative Commons licensed. Some of them are tiny snippets, the audio equivalent of the icons on a computer screen, and some are lengthy field recordings. ….if you’re just looking for audio clip art, or (with headphones, especially) fascinating “you are there” audio experiences; being transported to an audio landscape inhabited by gentle waves, ships’ horns, and thunderstorms is a legal way to escape ordinary consciousness.

Freesound really is free, too, though donations are accepted; it started as a project of the Music Technology Group of the Universitat Pompeu Fabra. One (very small) catch: you can listen all you want just by visiting the site; downloading the files requires free registration.

— Timothy LordFreesound
http://www.freesound.org/
Free