Popular Sites with CC Licensed Content
- Flickr -- Images from Flickr also appear in Google image search results.
- YouTube -- Do a keyword search > click on "Filters" > select "Creative Commons" under "Features"
- Google Images -- Search by keyword > click on "Tools" > click on "Usage Rights" and select "Creative Commons licenses"
- Wikipedia -- All content is under the CC BY-SA 3.0 unported license.
- Openverse -- Search and find images and audio files with CC licenses.
Ebook Sites
Remember, there are sites that provide public domain content (e.g., Pexels, and some content at government sites like the Library of Congress and Smithsonian Libraries) but public domain content should not be reused with a CC license.