De Gruyter Brill is a scholarly publisher offering academic books, journals, and online resources across 29 subjects for authors and librarians.

SpringerOpen is an open access publishing platform for researchers across science, technology, medicine, humanities, and social sciences to publish freely available work.

Érudit is an open-access digital platform providing scholarly documents in social sciences and humanities, including journals, books, and theses.

OAPEN is a global infrastructure connecting libraries, publishers, and researchers for peer-reviewed open access scholarly books to advance research.

Directory of Open Access Books is a discovery service for scholarly, peer-reviewed open access books.

Iowa State University Digital Press is an open access publisher facilitating broad dissemination of quality scholarship from ISU faculty and students.

Wikilivres.ru is the best free library for public domain literature and is used by literature enthusiasts and researchers.