Over 400,000 (and counting!) high-quality images. The website says "you can use any Pixabay image without attribution in digital and printed form," but do remember to give attribution so as not to unintentionally plagiarize. Shutterstock photos (identifiable by a large watermark) also show up in the results, and those require purchase.
This search portal will direct you to several different sites that allow you to search for items with Creative Commons licenses. Always make sure that you have the appropriate search limiters set on each site to ensure that you are in fact seeing results that have CC licenses.
Look for the "Any License" drop-down menu above the search bar. Select the type of license you need and do your search. Each image's page will have the specific license information in the bottom right-hand corner.
Allows you to search for images on the Web using keywords or uploaded images. From the results page, click on Tools and then click on Usage Rights. This will allow you to filter results based on permitted usage.
Streaming video library containing public domain digital movies uploaded by Archive users, ranging from classic full-length films to daily alternative news. Many are licensed with Creative Content licenses. Make sure to check the permissions for each item that you intend to use, since what is allowed will vary.