OpenGameArt.org

Free Loops, Samples, Acapellas and Software for Music Production. The ultimate pro audio resource and musicians community

ccMixter A music community site operated by ArtisTech Media -- founded by Creative Commons

Free Production Music by Jason Shaw AudionautiX.com

SoundGator.com - Free Sound Effects

Claim-free and completely free-to-use BGM and sound effects — safe for YouTube creators.

Audio Library is a YouTube channel dedicated to search, catalog, sort and publishes free music for content creators.