•GOOGLE SCHOLAR

•INTERNET ARCHIVE

•DICICTIONARY OF AFRICAN CHRISTIAN BIOGRAPHY

•FREE CHRISTIAN BOOKS

•OAPEN

•OPEN EDUCATIONAL RESOURCES COMMONS

•MERLOT

•MIT  OPEN COURSEWARE

•SAYLOR ACADEMY OPEN TEXTBOOKS

•KOHA

•OPEN BIBLIO

•LEADERSHIP CENTRAL

•BUSINESS BOOK SUMMARIES

•OPENSTAX

•HATHITRUST DIGITAL LIBRARY

•DIGITAL BODLEIAN

•CORE

•TROVE

•FAITHLIFE

•LEADERSHIP FREAK

•LEADERSHIP NOW

•ODOO

•PROJECT GUTENBERG

•THE NATIONAL ARCHIVES U.K

•OPEN LIBRARY

•WIKI BOOKS

•CHRISTIAN CLASSICS ETHEREAL LIBRARY

•THEOLOGICAL LIBRARIANSHIP

•THEOLOGY ON THE WEB

•CORE

•FAITHLIFE

•TROVE