The CC Search tool automatically filters your search to find Creative Commons licensed resources that you can share, use, and remix. However -- Do not assume that all of the results displayed are under a CC license. Always verify that the work is actually under a CC license by following the link.
A wide range of digital materials from libraries, archives and museums around the United States. "The copyright status of items in DPLA varies. DPLA links to a wide variety of different materials: many are in the public domain, while others are under rights restrictions but nonetheless publicly viewable. For individual rights information about an item, please check the “Rights” field in the metadata, or follow the link to the digital object on the content provider’s website for more information."
Multimedia Educational Resource for Learning and Online Teaching. Tens of thousands of learning modules, tutorials, readings, videos, textbooks, etc., all available (check licensing) for educational use.
"The Orange Grove repository, is Florida's digital repository for instructional resources. The repository provides an environment for educators to search for, use, remix, share, and contribute educational resources."