Copyright-Free Media Sources

The following are a few sites which list public domain, copyright-free, or Creative Commons media sources. You can also do a Google search using words such as “public domain”,  “copyright free” “creative commons” and “images”, “video”, “music”, etc. to find others, or use the usage rights menu in the search tools. The presence of a resource on any of these lists does not guarantee that all or any of the media in it are copyright-free. You are still responsible for checking the copyright status of media, and citing the source, where appropriate.

Make sure that any images you use from the Internet are high enough resolution for the intended use!

Images
https://images.google.com (type in a search term, then when you get results, click on “Tools”, and use the “Usage Rights” menu to select the desired license. Also use the Size menu to search for high res images.)
http://www.flickr.com/search (use drop down menu on the left to search by license type)
http://www.morguefile.com
http://www.nasa.gov/multimedia/imagegallery/index.html
http://www.photolib.noaa.gov/

Audio
https://www.youtube.com/audiolibrary/music
http://dig.ccmixter.org
http://www.bensound.com
http://incompetech.com/music/royalty-free/music.html
http://www.jamendo.com/en/
http://freemusicarchive.org
http://www.mobygratis.com/film-music.html
http://www.freeplaymusic.com (registration required - please note that if your project will be broadcast in any way or entered in a contest/festival, the music is NOT free)
https://www.youtube.com/audiolibrary/soundeffects (sound effects)
http://creativesounddesign.com/the-recordist-free-sound-effects/ (sound effects)
http://www.freesfx.co.uk (sound effects)
http://www.findsounds.com (sound effects)
http://www.freesound.org (sound effects)
http://www.grsites.com/archive/sounds/ (sound effects)

Video
http://vimeo.com/groups/freehd
http://mitchmartinez.com/free-4k-red-epic-stock-footage/
http://www.archive.org/details/stock_footage
https://www.videvo.net/
http://www.stockfootageforfree.com (registration required)
http://footagecrate.com (daily download limit of 5 clips)
http://www.hongkiat.com/blog/download-free-stock-video-intros/

Multiple Media Types
http://eduscapes.com/tap/topic98.htm
http://search.creativecommons.org/ (check each file for CC info)
https://commons.wikimedia.org/wiki/Commons:Free_media_resources

Please let me know if you find other good resources!