Creative Commons: This site has some great options for copyright friendly resources.
DrStockPhotos: "DrStockPhoto provides free stock photos that can be used without citation."
Flickr terms of use: This site will let you know the terms of use for publishing images on your website.
Free Foto: This site has a variety of quality images. Like most sites, be sure to check the terms of use before using the images.
PDPhoto: This site allows you to use many of their wonderful photos for projects. Be sure to check the terms of agreement before using their images.
Pexels: This site has some high quality images that can be used in classroom projects. Many of the images don't require attribution.
Photos For Class: This site will bring back copyright friendly images that are G rated.
Pics4Learning: This site provides a variety of images for educational purposes. Feel free to contribute your images so people like you can use them in education. I have offered a few images to this site.
Pixabay: "You can use any Pixabay image without attribution in digital and printed form, even for commercial applications."
Copyright Friendly Music
Wiki: This wiki has a variety of sound and music options. Be sure to read the terms of use before using in projects.
Find Sounds: My students use this site to get short sound clips for some of their projects.
Partnersinrhyme: General sound effects, public domain sound effects, free royalty free sound effects.
SoundBible: "SoundBible.com offers thousands of free sound effects, sound clips, and straight up sounds. "