Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines. Released in beta in November 2004, the Google Scholar index includes most peer-reviewed online academic journals and books, conference papers, theses and dissertations, preprints, abstracts, technical reports, and other scholarly literature, including court opinions and patents.

MIT OpenCourseWare (MIT OCW) is an initiative of the Massachusetts Institute of Technology (MIT) to put all of the educational materials from its undergraduate – and graduate-level courses online, freely and openly available to anyone, anywhere. MIT OpenCourseWare is a large-scale, web-based publication of MIT course materials.

TheFreeLibrary.com is a free reference website that offers full-text versions of classic literary works by hundreds of authors. It is also a news aggregator, offering articles from a large collection of periodicals containing over four million articles dating back to 1984. Newly published articles are added to the site daily. The site comprises a selection of articles from open-access journals that can in many cases also be found on a journal's own website.

The Internet Public Library (IPL, ipl2) was a non-profit, largely student-run website managed by a consortium, headed by Drexel University. Visitors could ask reference questions, and volunteer librarians and graduate students in library and information science formed collections and answered questions.

The Online Books Page is an index of e-text books available on the Internet. It is edited by John Mark Ockerbloom and is hosted by the library of the University of Pennsylvania. The Online Books Page lists over 2 million books and has several features.

TheFreeDictionary.com is an American online dictionary and encyclopedia that gathers information from a variety of sources. It cross-references the contents of the American Heritage Dictionary of the English Language, the Columbia Encyclopedia, the Computer Desktop Encyclopedia, the Hutchinson Encyclopedia and Wikipedia, as well as the Acronym Finder database, several financial & legal dictionaries, etc.

JURN is a unique search tool which helps you find free academic articles and books. JURN harnesses all the power of Google, but focusses your search through a hand-crafted and curated index. JURN now covers selected university fulltext repositories and many additional ejournals in science, biomedical, business, natural world, law, arts and humanities.

Oxford University Press (OUP) publishes the highest quality journals and delivers this research to the widest possible audience. This was achieved by working closely with our society partners, authors, and subscribers in order to provide them with publishing services that support their research needs.

Academic Journals is a broad-based publisher of peer-reviewed open access journals. Academic Journals currently publishes 111 open access journals covering art and humanities, engineering, medical science, social sciences, biological sciences, physical sciences and agricultural sciences.

The Directory of Open Access Journals was launched in 2003 at Lund University, Sweden, with 300 open access journals and today contains ca. 9000 open access journals covering all areas of science, technology, medicine, social science and humanities.

OMICS International (and its subsidiaries), is an Open Access publisher and international conference Organizer, which owns and operates 700 peer-reviewed Clinical, Medical, Life Sciences, and Engineering & Technology journals and hosts 3000 scholarly conferences per year in the fields of clinical, medical, pharmaceutical, life sciences, business, engineering, and technology.

SAGE is the world's 5th largest journals publisher. Our portfolio includes more than 1000 journals spanning the Humanities, Social Sciences, and Science, Technology, and Medicine, and more than 400 are published on behalf of learned societies and institutions.

SpringerOpen, launched in June 2010, includes Springer’s portfolio of 200+ peer-reviewed fully open access journals across all areas of science. In August 2012, due to the growing demand for open access and the success of our SpringerOpen journals, we expanded our offering to open access books. Published under the SpringerOpen brand they complement our established open access journal portfolio.

Scientific Research Publishing (SCIRP) is an academic publisher of open access journals. It also publishes academic books and conference proceedings. SCIRP currently has more than 200 open access journals in the areas of science, technology and medicine.

Bookboon.com was established in Denmark in 1988, under the name Ventus, and has always focused on publishing educational material for students and business professionals. The company continuously aims to set new standards in the world of modern publishing based on its readers’ needs. In 2005, the company made a strategic leap and became the world’s first online book publisher to provide free textbooks for students.

PubMed Central® (PMC) is a free full-text archive of biomedical and life sciences journal literature at the U.S. National Institutes of Health's National Library of Medicine (NIH/NLM).

e-journals are scholarly journals or intellectual magazines that can be accessed via electronic transmission. Some journals are 'born digital' in that they are solely published on the web and in a digital format, but most electronic journals originated as print journals, which subsequently evolved to have an electronic version, while still maintaining a print component.

InTechOpen is the world's largest Science, Technology and Medicine Open Access book publisher. With a goal to provide free online access to research since 2004, InTechOpen has published 3,038 books and 46,833 scientific works total by 101,941 international scientists. Our overall mission is to help academics make a greater impact by giving readers free access to all published work.

JSTOR (short for Journal Storage) is a digital library founded in 1995. Originally containing digitized back issues of academic journals, it now also includes books and primary sources, and current issues of journals. It provides full-text searches of almost 2,000 journals.

AGORA is the acronym for the Access to Global Online Research on Agriculture program. It was launched in 2003 by the Food and Agriculture Organization of the United Nations (FAO) in partnership with Cornell University and up to 70 of the world’s leading science publishers, to provide free or low-price online access to leading peer-reviewed publications in agriculture and related biological, environmental and social sciences.

HINARI Access to Research in Health Programme was set up by the World Health Organization and major publishers to enable developing countries to access collections of biomedical and health literature. There are up to 13,000 e-journals and up to 29,000 online books available to health institutions in more than 100 countries.

Online Access to Research in the Environment (OARE) is led by the United Nations Environment Programme (UNEP) in partnership with major publishers. The programme enables developing countries to gain access to one of the world’s largest collections of environmental science research.

The Access to Research for Development and Innovation (ARDI) program is coordinated by WIPO together with its partners in the publishing industry with the aim to increase the availability of scientific and technical information in developing countries. Currently, over 100 publishers provide access to around 30,000 journals, books, and reference works for 121 developing countries & territories.

Research4Life is the collective name for 4 programs - HINARI (focusing on health), AGORA (focusing on agriculture), OARE (focusing on environment), and ARDI (focusing on applied science and technology) that provide free or low-cost online access to peer-reviewed international scientific journals, books and databases. Research4Life has an updated count of 69,000 resources available across its four programmes.

African Journals OnLine (AJOL) is a non-profit organisation dedicated to improving the online visibility of and access to the published scholarly research of African-based academics. By using the internet as a gateway, AJOL aims to enhance conditions for African learning to be translated into African development.

RSC Advances is an online-only peer-reviewed scientific journal covering research on all aspects of the chemical sciences. It was established in 2011 and is published by the Royal Society of Chemistry.

EBSCO offers library resources to customers in academic, medical, K–12, public library, law, corporate, and government markets. Its products include EBSCONET, a complete e-resource management system, and EBSCOhost, which supplies a fee-based online research service with 375 full-text databases, a collection of 600,000-plus ebooks, subject indexes, point-of-care medical references, and an array of historical digital archives.

TEEAL is The Essential Electronic Agricultural Library. Launched in 1999, it is a self-contained agricultural research library with full-text articles and graphics of over 200 major journals. TEEAL is a project of Cornell University's Albert R. Mann Library in cooperation with over 60 major scientific publishers, societies and index providers.

ProQuest is committed to empowering researchers and librarians around the world. Its innovative information content and technologies increase the productivity of students, scholars, professionals and the libraries. Through partnerships with content holders, ProQuest preserves rich, vast & varied information and packages it with digital technologies that enhance its discovery, sharing & management.

BMC has an evolving portfolio of some 300 peer-reviewed journals, sharing discoveries from research communities in science, technology, engineering and medicine. In 1999 we made high quality research open to everyone who needed to access it – and in making the open access model sustainable, we changed the world of academic publishing.

POPLINE contains the world’s most comprehensive collection of population, family planning and related reproductive health and development literature. An international resource, POPLINE helps program managers, policy makers, and service providers in low- and middle-income countries and in development-supportive agencies and organizations gain access to scientific articles, reports, books, and unpublished documents.

The Education Resources Information Center (ERIC) is an online digital library of education research and information. The mission of ERIC is to provide a comprehensive, easy-to-use, searchable, Internet-based bibliographic and full-text database of education research and information for educators, researchers, and the general public.

Questia is an online commercial digital library of books and articles that has an academic orientation, with a particular emphasis on books and journal articles in the humanities and social sciences. The great majority of items are under copyright, for which Questia has paid a fee to the copyright owners. All the text in all the Questia books and articles is available to subscribers; the site also includes integrated research tools.

Bringing together 2 million digitized entries across Oxford University Press’s Dictionaries, Companions and Encyclopedias, Oxford Reference is the premier online reference product, spanning 25 different subject areas. As you browse through Oxford Reference, you may find results that range from short-entry, general reference to more in-depth articles on specialized subjects.

Science Daily is an American website that publishes press releases and churnalism about science. ScienceDaily is one of the Internet’s most popular science news web sites. Since starting in 1995, the award-winning site has earned the loyalty of students, researchers, healthcare professionals, government agencies, educators and the general public around the world.

ScienceDirect is Elsevier’s leading information solution for researchers, Elsevier’s leading platform of peer-reviewed scholarly literature. ScienceDirect combines authoritative, full-text scientific, technical and health publications with smart, intuitive functionality so that users can stay informed in their fields and can work more effectively and efficiently.

Emerald Publishing was founded in 1967 to champion new ideas that would advance the research and practice of business and management. Today, we continue to nurture fresh thinking in applied fields where we feel we can make a real difference, now also including health and social care, education and engineering. Emerald manages a portfolio of nearly 300 journals, more than 2,500 books and over 1,500 teaching cases.

The International Monetary Fund's (IMF) eLibrary simplifies analysis and research with direct access to the IMF’s periodicals, books, working papers and studies, and data and statistical tools. You will find information and perspective on macroeconomics, globalization, development, trade and aid, technical assistance, demographics, emerging markets, policy advice, poverty reduction, and so much more.

The BMJ (formerly the British Medical Journal) is an international peer reviewed medical journal and a fully online first publication. The website is updated daily with original articles, podcasts, videos, and blogs and organised into four main content streams—research, education, news and views, and campaigns. In addition, the site is fully searchable, with an archive back to 1840 and numerous topic collections on clinical and non-clinical subjects.