ARTstor has an excellent selection of photographs by influential photographers. A great place to find images to include in presentations, or just to see a wide variety of photography styles.
Digital library of over one million images related to art, architecture, the humanities, and social sciences.
ARTstor (and not ACC) requires that you create a free account before accessing.
Kanopy is an excellent source for documentaries about photographers, as well as videos related to lighting, composition, posing and other techniques.
More than 26,000 streaming videos, including films from the Criterion Collection, festival circuit documentaries, and TV series. Kanopy (and not ACC) requires that you create a free account before accessing.