The International Children's Digital Library provides access to the best of children's literature from around the world. Browse titles by age range, subject, language, book length, even the color of the cover!
is a digital public library and collaboration platform that offers openly licensed lectures, textbooks, full courses, games and assessments for K-12 and higher ed. Basic and advanced search by subject education level, and standard.
In addition to many open access books more have been made free in response to the COVID-19 pandemic.
Among the publishers currently opting to make content free on Project MUSE are Johns Hopkins University Press (all books and journals), Ohio State University Press (all books and journals), University of Nebraska Press (all books and journals), University of North Carolina Press (all books), Temple University Press (all books), and Vanderbilt University Press (selected books).