Although most of the content available on these websites can be used for free, it is recommended that you cite all materials that don't belong to you in your courses. It's also important to read any licensing information provided with the content before using it. The Copyright Office at York University runs information sessions on copyright practices and will also review materials you are thinking of using in your courses to ensure compliance with the Copyright Act of Canada. They also have a guide on how to use free content in courses. Contact their office for more information. As well, if you are unfamiliar with Creative Commons licensing read this post. For questions regarding free resources contact Anna Augusto Rodrigues, Instructional Designer, Teaching Commons.
Images
The following websites have a variety of images
Flickr (Search for Creative Commons License)
Pixabay
Pexels
Unsplash
Pics For Learning
Pik Wizard
History/Museums/Art
Getty Open Content Program
Over 100,000 images from the J. Paul Getty Museum and the Getty Research Institute including more than 72,000 from the Research Institute's Foto Arte Minore archive. Other content include photographs, artists' sketchbooks, watercolors, rare prints from the 16th through the 18th century, and 19th-century architectural drawings of cultural landmarks.
British Library
Over one million images have been released on Flickr Commons. Available for anyone to use, remix and re-purpose.
Toronto Public Library Digital Archive
Many images contained in these archives can be downloaded and reproduced in print or electronic format for educational and research use.
Industry/Business Images
Burst
Quirky/Artistic Images
Gratisography
Nature/Landscapes Images
Superfamous
Free Nature Stock
Images from countries/cities around the world
Picography
Bucketlistly
Clipart
Open Clip Art
Vecteezy (Icons as well)
Public Domain Clip Art
Icons
Freepik (also backgrounds, photos and patterns)
Icons for Everything
Audio
Music
Pond 5
Incompetech
Bensound
Purple Planet Music
CC Mixter (re-mixing of tracks is allowed)
MobyGratis (150 tracks of Moby's music that can be used for independent, non-profit films, videos and shorts)
Sound Effects
Free Sound Effects
Sound Jay
Partners in Rhyme (stock music as well)
Sound Gator
Audio Micro (stock music as well)
Video
Life of Vids
XStock Video
Videvo
Other websites with free resources
National Science Digital Library
Smithsonian Research Online
Chemistry Collective
Open Access Artworks from The Metropolitan Museum of Art
Process Arts (Online community for sharing art, design and media projects)
CBC Digital Archives
Library and Archives Canada
National Film Board
Radio Garden – Interactive map of live radio stations across the globe
List to the 42 Best Educational Podcasts in 2018
Museum Views - Virtual Tours of Museums through Google
Virtual Museum of Canada
Open Educational Resources
Open Educational Resources (OER) are educational teaching materials that are found online. An OER may be a textbook, a lesson plan, a multimedia project, a documentary or even an assignment sheet. Most OERs are free to use and modify for your own use.
For more info on OERS please go to this link.