Operated by Bielefeld University Library, BASE provides more than 240 million documents from more than 8,000 content providers with access to full texts of about 60% of indexed documents for free, including books, journals, images, and datasets.
"OpenDOAR is the quality-assured, global Directory of Open Access Repositories. You can search and browse through thousands of registered repositories based on a range of features, such as location, software or type of material held." (April 2024: Our site will be moving soon.)
"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."
Provides e-texts of books in the public domain (including classic literature) available to download in plain text or ZIP files. The site is searchable and browsable by title and author.
Full-text ebooks and chapters across all subjects covered by Routledge, CRC Press, and other T&F imprints in the humanities, social sciences, and behavioral sciences, available to read online for free.