• Prelinger Archives at archive.org – https://archive.org/details/prelinger
  Over 2000 films in the public domain. Includes home movies, old commercials, Coronet instructional films, and more.
• Community Video at archive.org – https://archive.org/details/opensource_movies
• IICADOM (The International Institute for the Conservation, Archiving and Distribution of Other People’s Memories) – https://archive.org/details/iicadom
  More than 1000 home movies.
• Pond5 Public Domain – https://www.pond5.com/free
  Nearly 10,000 historical film clips.
• Videezy – https://www.videezy.com/
  Stock video and b-roll footage.
• Pixabay – https://pixabay.com/en/videos/
  Free videos and stock footage.
• Beachfront B-Roll – http://www.beachfrontbroll.com/
  Stock video footage and animated backgrounds.
• Footage Crate – http://footagecrate.com/
  Stock footage.
• Movietools – http://www.movietools.info/
  Free animated 2D and 3D background animations.
• Video Blocks – https://www.videoblocks.com/
• British Museum – https://www.britishmuseum.org/research/collection_online/search.aspx

Free and Creative Commons licensed sound effects and music

• Freesound.org – http://www.freesound.org/
  Sound only, not songs.
• SoundCloud – https://soundcloud.com/
  A music sharing site with some tracks and samples under Creative Commons license.
• Free Music Archive – http://freemusicarchive.org/
  Some tracks are under Creative Commons license or in the public domain.
• Community Audio at archive.org – https://archive.org/details/opensource_audio
  Some tracks are under Creative Commons licenses.
• BBC Sound Effects http://bbcsfx.acropolis.org.uk/
  These are being released under the RemArc licence, which means that they can be used for “personal, educational or research purposes”.
• Moby Gratis https://mobygratis.com/
• Video Blocks – https://www.videoblocks.com/
• Incompetech https://incompetech.com/music/royalty-free/