Searches 500 million images which have Creative Commons licenses or are in the public domain; refine to those you wish to use commercially or modify/adapt.
Aggregates images from various individuals and providers including Pixabay. All photos and videos on Pexels can be downloaded and used for free. Attribution is appreciated but not required.
A digital library of over 500,000 images of art, architecture and archeology from a wide range of cultures and time periods to support teaching and learning in the humanities and social sciences. Artstor's high-quality collections and key functionality are now available via JSTOR.
Access to unique and historically important digital collections: over two million photographs, documents, letters, artwork, diaries, oral histories, films, advertisements, musical recordings, and more.
An aggregated search across digital collections from libraries, archives, and museums in the United States as well as curated exhibitions and primary source sets developed for classroom use.