http://www.soungle.com/ Enter a royalty free sound effect you want and click the search button to find it.
http://www.soundclick.com/ SoundClick, established in 1997, is an originator of the social media format. SoundClick continues to be the leading free music community featuring signed and unsigned bands plus state of the art social media tools.
http://ccmixter.org/ ccMixter.org is a diverse, international music community. We collaborate and create music that is free for others to use in their videos, remixes, games, and apps — down to the individual instrument components. We use Creative Commons licenses (not copyright lockdown!) so you can interact with our music.
http://freemusicarchive.org/ The Free Music Archive is an interactive library of high-quality, legal audio downloads directed by WFMU, the most renowned freeform radio station in America. Radio has always offered the public free access to new music. The Free Music Archive is a continuation of that purpose, designed for the age of the internet. It was…
http://www.epidemicsound.com/ Royalty Free Music Re-imagined Carefully curated professional music library tailored for your film & video production.