Blue Mountain Project is Historic Avant-Garde Periodicals for digital research (issued by Princeton University) is the common work of scholars, librarians, curators, and digital humanities researchers.

Free Tech is database of free / open access online computer science books, textbooks, and lecture Notes
The collection is about 1238 free books (and growing).

The Directory of Open Access Books (DOAB) is a database that refers readers to open access books on publishers’ websites. These are peer-reviewed books that are published under an open access licence. DOAB has 34309 Academic peer-reviewed books from 412 publishers

DOAJ is a community-curated online directory that indexes and provides access to high quality, open access, peer-reviewed journals.All DOAJ services are free of charge including being indexed. DOAJ has 15,891 indexed journals and 5,603,579 indexed articles (and growing).

The World Bank Open Knowledge Repository (OKR) provides free access to all World Bank publications since 2000. Around 31,646 publications are available at World Bank OKR

The IMF Government Finance Statistics (GFS) is the standard reference source on governments of IMF member countries. IMF E Library has 2,999 books, 19,120 Journals and issues along 67,579 chapters and articles

GreenFILE is a free research database covering all aspects of human impact to the environment. Its collection of scholarly, government and general-interest titles includes content on global warming, green building, pollution, sustainable agriculture, renewable energy, recycling, and more. Green FILE has Indexing and abstracts of more than 1.1 million records and open access full text for more than 15,800 records

OARE (Online Access to Research in the Environment) is a public-private partnership sponsored by the U.N Environment Programme and Yale University. It provides access to a wide range of scientific journals, books and other content resources in the environmental sciences and at prices which reflect the state of national economies in the developing world. OARE give acess to 2543 free Journals and acess to 8118 free books

Open Humanities contains peer-reviewed journals, books on humanities and exploring new forms of scholarly communication. OH has 60+ books and 20+ Journals.

Brill’s publications focus on the humanities and social sciences, international law and selected areas in the sciences. Brill has 33 online acess journals, around 582 free books with approx 22,500 free articles.

IT ebooks is collection of free information technology books for downloading. IT has 30 free e books.

The Electronic Library of Mathematics contains online journals, article collections, monographs, and other electronic resources in the field of mathematics.

Google Scholar provides a simple way to broadly search for scholarly literature. Search across a wide variety of disciplines and sources: articles, theses, books, abstracts and court opinions.

EBSCO Open Dissertations now includes the content from American Doctoral Dissertations. It is a free database with records for more than 1.4 million electronic theses and dissertations from more than 320 universities around the world.

Internet Archive is a non-profit library of millions of free books, movies, software, music, websites, and more.

Project Gutenberg is an online library of free eBooks. Project Gutenberg was the first provider of free electronic books, or eBooks. Currently It has collection of 60,000 e books

Open Access at the University of Cambridge is managed by two dedicated support services: Open Access and Research Data Management. These groups assist the University's researchers and research students in making their research outputs freely accessible in the public domain. It has 315 Open access journals, 33586 Open access articles and 101 open access books

The pure gold open access journals published by SAGE. All articles published in the journals provide worldwide, barrier-free access to the full-text of articles online, immediately on publication under a creative commons license.

CORE is the world’s largest collection of open access research papers. It aggregates and enriches open access research papers from around the world.Core documents 200 million papers from around the world.

Thousands of Open Access ebooks are available from top scholarly publishers, including Brill, Cornell University Press, De Gruyter, and University of California Press. More than 6,500 open access ebooks and journals

OATD provide resource for finding open access graduate theses and dissertations published around the world. Metadata (information about the theses) comes from over 1100 colleges, universities, and research institutions. OATD currently indexes over 5 million theses and dissertations (and growing).

Project MUSE offers open access (OA) books and journals from several distinguished university presses and scholarly societies. There are over 2,000 open access books and a small number of fully OA journals on the MUSE platform

Wiley online covers journals, books, and research resources, covering life, health, social, and physical sciences. It has 2,500+ Journals and 24,000+ online books (and growing).

Collection of open access textbooks provided by the University of South Florida.

Online Books page is an e-book website contains myriad of books in various disciplines.The site is hosted by the University of Pennsylvania Libraries. It facilitates access to 2 million books that are freely readable over the Internet.

BENTHAM Open publishes a number of peer-reviewed open access journals. These free-to-view online journals cover all major disciplines of science, technology, medicine and social sciences.

Taylor & Francis offers a variety of publishing options, open access journal publications of peer reviewed and scholarly sources are available

E-Books Directory is links to freely accessible ebooks have upto 10839 free e-books in 709 categories.

Open textbooks are licensed by authors and publishers to be freely used and adapted. About 840 books are available for free use

OpenStax has created peer-reviewed, openly-licensed textbooks, which are available in free digital formats on different subjects.

The B.C. Open Textbook Collection is selection of open textbooks for a variety of subjects Open textbooks that have been reviewed and include ancillary materials (quizzes, test banks, slides, videos, etc.). Upto 400 open access books are available.

IEEE Access is a multidisciplinary, open access journal of the IEEE. Presenting the results of original research across all of IEEE’s fields of interest, IEEE Access provides authors a high-quality open access journal with a rapid yet rigorous peer review process of 4 to 6 weeks.

arXiv is a free distribution service and an open-access archive for 1.8 million scholarly articles (and growing) in the fields of physics, mathematics, computer science, quantitative biology, quantitative finance, statistics, electrical engineering and systems science, and economics.

The INIS repository includes research on a wide range of nuclear-related topics, from environmental science and energy storage to radiology and many more. Approximately 120 000 bibliographic records and 13 000 full-text PDF documents are added each year.

The Stanford Encyclopedia of Philosophy organizes scholars from around the world in philosophy and related disciplines to create and maintain an up-to-date reference work.

NOBA is a free online platform that provides high-quality, flexibly structured textbooks and educational materials in the field of psychology. Free Sign up is require to fully access the resources.

Science direct offers over 1.4 million open articles. Articles published open access are peer-reviewed and made freely available for everyone along with 93 open access Journals.

SpringerOpen journals and books are made freely and permanently available online immediately upon publication. They are subject to high-level peer review, author and production services ensuring quality and reliability of the work.

Intech is one of the largest multidisciplinary open access publisher of books covering the fields of science, technology, medicine, engineering, health sciences, life sciences, social sciences and humanities. Over 5,100 peer-reviewed Open Access books are available at Intech

The Access to Research for Development and Innovation (ARDI) program, coordinated by WIPO together with its partners in the publishing industry, aims to increase the availability of scientific and technical information in developing countries. ARDI give access to 1457 free Journals and 5048 free books.

The WomanStats Project is the most comprehensive compilation of information on the status of women in the world. The Project facilitates understanding the linkage between the situation of women and the security of nation-states. Free Sign up is require to fully access the resources.

Luminos is University of California Press’s Open Access publishing program for monographs. With the same high standards for selection, peer review, production and marketing as our traditional program, Luminos is a transformative model, built as a partnership where costs and benefits are shared.

An international, open-access review of literature and culture at the nexus of history, theology, religion, and arts.

MIT Open Course Ware (MIT OCW) is a multidisciplinary open educational resources repository, containing thousands of MIT courses, curriculum ranging from the introductory to the most advanced graduate level. Each OCW course includes a syllabus, some instructional materials, and some learning activities . Many courses also have complete video lectures, free online textbooks.

An online platform that provides cultural and educational media and resources. It provides its users movies, language resources, K-12 resources, online courses, certificate courses, e-books, audiobooks, text books on different subjects and much more. It has collection of 300 language lessons 1,150 free movies 700 audio books, up to 1000 books and much more to offer.

MERLOT (Multimedia Education Resource for Learning and Online Teaching) is multidiscipline online repository and international consortium of institutions (and systems) of higher education, industry partners, professional organizations and individuals who work together in various ways to provide users OER (Open Educational Resources).