Adobe's Online Color Palette Helper Tool ( formerly known as Kuler )
https://color.adobe.com/
Free Fonts
http://www.dafont.com/top.php?l[]=10
Public Domain MIDI and Score Sheets
http://www.mutopiaproject.org/
Free Music
http://www.mobygratis.com/
https://soundcloud.com/freesongstouse
http://www.purple-planet.com/
Library of congress - National Jukebox - Public domain historical & musical recordings:
http://www.loc.gov/jukebox/
Free Sounds
https://www.freesound.org/ ( After free registration )
Free Images, video, sounds
https://commons.wikimedia.org/wiki/Main_Page
Free video, Photo, Sounds :
https://archive.org/
Freeish music and sounds:
https://www.youtube.com/audiolibrary/music
Free Lowres purchasable higres video and images:
http://www.openfootage.net/
Old Movie Theater News Reel Footage:
https://www.youtube.com/user/britishpathe/videos
http://www.britishpathe.com/pages/in-the-news/
NASA Images
https://images.nasa.gov/
https://www.nasa.gov/multimedia/guidelines/index.html
Library of Congress Online Image Collection ( Drawings text and photographs )
http://www.loc.gov/pictures/
Yale FSA-OWI Map 1935-1944 Rural USA Public Domain Images
http://photogrammar.yale.edu/map/
Free After Effects Tutorials:
http://www.videocopilot.net/tutorials/
Professional Video Editing Forum:
https://www.creativecow.net/
Real Time Rendering
www.realtimerendering.com