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If you find a scholarly article on the free web, the Unpaywall extension in your browser will indicate whether an open access version of the article can be downloaded.
JSTOR Database Open Content Module
TheJSTORdatabase open access module contains academic content that is open to everyone, anywhere. Search free articles and open access book chapters.
Open Syllabus Project
If you're looking for examples of how other instructors have approached teaching similar material, consider visiting the Open Syllabus Project. You can search by title (e.g., They Say I Say), authors, and discipline.
Smithsonian Open Access, where you can download, share, and reuse millions of the Smithsonian’s images—right now, without asking. With new platforms and tools, you have easier access to nearly 3 million 2D and 3D digital items from our collections—with many more to come. This includes images and data from across the Smithsonian’s 19 museums, nine research centers, libraries, archives, and the National Zoo.
The Open Image Collections is a collection of digital image sources suitable for teaching, learning and research. Sources include museum digital collections, stock images, photo archives, design resources and image search engines.