Pixabay.com is a website for sharing photos, illustrations, vector graphics, film footage and music, exclusively under the custom Pixabay license, which generally allows the free use of the material with some restrictions.
HathiTrust Digital Library is a large-scale collaborative repository of digital content from research libraries including content digitized via Google Books and the Internet Archive digitization initiatives, as well as content digitized locally by libraries
DOAB is a community-driven discovery service that indexes and provides access to scholarly, peer-reviewed open access books and helps users to find trusted open access book publishers. All DOAB services are free of charge and all data is freely available.
Project Gutenberg is a volunteer effort to digitize and archive cultural works, as well as to "encourage the creation and distribution of eBooks." It was founded in 1971 by American writer Michael S. Hart and is the oldest digital library.
openNCCC is a library of open educational resources that promotes exploration, creation, and collaboration with the goal of enriching teaching and learning in North Carolina and around the world.