Free music:
https://licensing.jamendo.com/en/catalog
Sound effects:
http://www.freesound.org/browse/tags/music/
http://soundbible.com/free-sound-effects-1.html
https://www.partnersinrhyme.com/pir/PIRsfx.shtml
Stock videos:
http://www.motionelements.com/free/stock-footage
http://www.free-hd-footage.com/
http://www.beachfrontbroll.com/
http://www.free-video-footage.com/index.php?svideo=1