Hundreds of Open Access Ebooks covering a variety of subject areas.

African Journals OnLine (AJOL) is the world's largest and preeminent platform of African-published scholarly journals. AJOL is a Non-Profit Organisation that (since 1998) works to increase global & continental online access, awareness, quality & use of African-published, peer-reviewed research. Millions of monthly downloads by site users from nearly every country in the world are an indication of the need and widespread use of the AJOL initiative. More than half of the repeat users are from Africa.

Hosted by Columbia University Libraries is a collection of internet resources on Africa; the site also hosts a comprehensive portal for United Nations Agencies on Africa, a useful collection of official documentation on institutional development.

The Bielefeld Academic Search Engine (BASE) is operated by the Bielefeld University Library in Germany, and it offers more than 240 million documents from more than 8,000 sources. Sixty percent of its content is OA, and you can filter your search accordingly.

BASE has rigorous inclusion requirements for content providers regarding quality and relevance, and they maintain a list of content providers for the sake of transparency, which can be easily found on their website. BASE has a fairly elegant interface. Search results can be organized by author, title, or date.

From the search results, items can be selected and exported, added to favorites, emailed, and searched in Google Scholar. There are basic and advanced search features, with the advanced search offering numerous options for refining search criteria. There is also a feature on the website that saves recent searches without additional steps from the user.

The Bielefeld Academic Search Engine (BASE) is operated by the Bielefeld University Library in Germany, and it offers more than 240 million documents from more than 8,000 sources. Sixty percent of its content is OA, and you can filter your search accordingly.

BASE has rigorous inclusion requirements for content providers regarding quality and relevance, and they maintain a list of content providers for the sake of transparency, which can be easily found on their website. BASE has a fairly elegant interface. Search results can be organized by author, title, or date.

From the search results, items can be selected and exported, added to favorites, emailed, and searched in Google Scholar. There are basic and advanced search features, with the advanced search offering numerous options for refining search criteria. There is also a feature on the website that saves recent searches without additional steps from the user.

Collection: 276,019,066 documents; 9,286 content providers

Bioline International is a good site for articles on public health and international development.

BioMed Central provides OA research from more than 300 peer-reviewed journals. While originally focused on resources related to the physical sciences, math, and engineering, BioMed Central has branched out to include journals that cover a broader range of disciplines, with the aim of providing a single platform that provides OA articles for a variety of research needs. You can browse these journals by subject or title, or you can search all articles for your required keyword.

BioMed Central has a commitment to peer-reviewed sources and to the peer review process itself, continually seeking to help and improve the peer review process. They're "committed to maintaining high standards through full and stringent peer review."

Additionally, the website includes resources to assist and support editors as part of their commitment to providing high-quality, peer-reviewed OA articles.

Collection: 507,212

The CIA World Factbook is a little different from the other resources on this list in that it is not an online journal directory or repository. It is, however, a useful free online research database for academics in a variety of disciplines.

All the information is free to access, and it provides facts about every country in the world, which are organized by category and include information about history, geography, transportation, and much more. The World Factbook can be searched by country or region, and there is also information about the world's oceans.

This site contains resources related to the CIA as an organization rather than being a scientific journal database specifically. The site has a user interface that is easy to navigate. The site also provides a section for updates regarding changes to what information is available and how it is organized, making it easier to interact with the information you are searching for.

Collection: 266 countries

CORE is a multidisciplinary aggregator of OA research. CORE has the largest collection of OA articles available. It allows users to search more than 219 million OA articles. While most of these link to the full-text article on the original publisher's site, or to a PDF available for download, five million records are hosted directly on CORE.

CORE's mission statement is a simple and straightforward commitment to offering OA articles to anyone, anywhere in the world. They also host communities that are available for researchers to join and an ambassador community to enhance their services globally. In addition to a straightforward keyword search, CORE offers advanced search options to filter results by publication type, year, language, journal, repository, and author.

CORE's user interface is easy to use and navigate. Search results can be sorted based on relevance or recency, and you can search for relevant content directly from the results screen.

Collection: 219,537,133 OA articles

Other Services: Additional services are available from CORE, with extras that are geared toward researchers, repositories, and businesses. There are tools for accessing raw data, including an API that provides direct access to data, datasets that are available for download, and FastSync for syncing data content from the CORE database.

CORE has a recommender plug-in that suggests relevant OA content in the database while conducting a search and a discovery feature that helps you discover OA versions of paywalled articles. Other features include tools for managing content, such as a dashboard for managing repository output and the Repository Edition service to enhance discoverability.

Leading publisher of open access scientific content with nearly 400 scholarly journals across all major disciplines. Discover our open access portfolio. De Gruyter is home to around 100 fully open access journals across STEM and HSS disciplines.

Run by Indiana University, the Digital Library of the Commons (DLC) Repository is a multidisciplinary journal repository that allows users to access thousands of free and OA articles from around the world. You can browse by document type, date, author, title, and more or search for keywords relevant to your topic.

DCL also offers the Comprehensive Bibliography of the Commons, an image database, and a keyword thesaurus for enhanced search parameters. The repository includes books, book chapters, conference papers, journal articles, surveys, theses and dissertations, and working papers. DCL advanced search features drop-down menus of search types with built-in Boolean search options.

Searches can be sorted by relevance, title, date, or submission date in ascending or descending order. Abstracts are included in selected search results, with access to full texts available, and citations can be exported from the same page. Additionally, the image database search includes tips for better search results.

Collection: 10,784

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. All DOAB services are free of charge and all data is freely available.

Publications in DiVA are disseminated and made available digitally to the outside world. There are about twenty different types of publication in DiVA adapted for their specific content, e.g. article in journal, dissertation, book, chapter in book, conference paper, artistic output, report and student thesis.

DOAJ is a community-curated online directory that indexes and provides access to high quality, open access, peer-reviewed journals.

E-Books Directory is a daily growing list of freely downloadable ebooks, documents and lecture notes found all over the internet.You can submit and promote your own ebooks, add comments on already posted books or just browse through the directory\r\nbelow and download anything you need.

Run by the British Library, the E-Theses Online Service (EThOS) allows you to search over 500,000 doctoral theses in a variety of disciplines. All of the doctoral theses available on EThOS have been awarded by higher education institutions in the United Kingdom.

Although some full texts are behind paywalls, you can limit your search to items available for immediate download, either directly through EThOS or through an institution's website. More than half of the records in the database provide access to full-text theses.

EThOS notes that they do not hold all records for all institutions, but they strive to index as many doctoral theses as possible, and the database is constantly expanding, with approximately 3,000 new records added and 2,000 new full-text theses available every month. The availability of full-text theses is dependent on multiple factors, including their availability in the institutional repository and the level of repository development.

Collection: 500,000+

ERIC is an online library of education research and information, sponsored by the Institute of Education Sciences (IES) of the U.S. Department of Education.

Hosted by Stanford University, contains articles from a vast range of journals.

Many recent articles are free while others are available after 12 months.

Journals on epidemiology, health education, health policy and planning, health promotion, physiology, research, computer science, medicine, agriculture, ecology, political science, and economics.

Open access collection of outstanding out-of-print books in the humanities available as free e-books courtesy of The Humanities Open Book project. Once in a title you can download in EPUB or Mobi format.

The Knowledge Management Portal is an online resource that integrates health and health-related information from the Ministry of Health and beyond to provide a single point of access to valuable information that facilitates evidence-based decision-making. It is a pool of knowledge resources used by policymakers, researchers, managers, planners and anybody whose aim is to accumulate more knowledge and use it to create a gratifying healthy environment. The portal provides data for evidence-based decision making to improve the quality of health care for the people of Uganda. It also supports the design of effective health worker processes for the Ministry, local government, NGOs and other private sector, organizations, health educators, and remote health workers.

OAPEN promotes and supports the transition to open access for academic books by providing open infrastructure services to stakeholders in scholarly communication. We work with publishers to build a quality-controlled collection of open access books and provide services for publishers, libraries, and research funders in the areas of hosting, deposit, quality assurance, dissemination, and digital preservation.

Open Text Book is a registry of textbooks and related materials which are open, that is free for anyone to use, reuse and redistribute

Textbooks by Subject

• Business+
• Computer Science+
• Education+
• Engineering & Technology+
• Humanities+
• Journalism, Media Studies & Communications+
• Law+
• Mathematics+
• Medicine+
• Natural Sciences+
• Social Sciences+
• Student Success

Paperity boasts its status as the "first multidisciplinary aggregator of OA journals and papers." Their focus is on helping you avoid paywalls while connecting you to authoritative research. In addition to providing readers with easy access to thousands of journals, Paperity seeks to help authors reach their audiences and help journals increase their exposure to boost readership.

Paperity has journal articles for every discipline, and the database offers more than a dozen advanced search options, including the length of the paper and the number of authors. There is even an option to include, exclude, or exclusively search gray papers.

Paperity is available for mobile, with both a mobile site and the Paperity Reader, an app that is available for both Android and Apple users. The database is also available on social media. You can interact with Paperity via Twitter and Facebook, and links to their social media are available on their homepage, including their Twitter feed.

Collection: 8,837,396

PDF Drive is your search engine for PDF files. As of today,  PDF Drive has 86,082,494 eBooks for you to download for free. No annoying ads, no download limits, enjoy it and don't forget to bookmark and share the love!

Public Library of Science (PLOS) is a big player in the world of OA science. Publishing 12 OA journals, the nonprofit organization is committed to facilitating openness in academic research. According to the site, "all PLOS content is at the highest possible level of OA, meaning that scientific articles are immediately and freely available to anyone, anywhere."

PLOS outlines four fundamental goals that guide the organization: break boundaries, empower researchers, redefine quality, and open science. All PLOS journals are peer-reviewed, and all 12 journals uphold rigorous ethical standards for research, publication, and scientific reporting.

PLOS does not offer advanced search options. Content is organized by topic into research communities that users can browse through, in addition to options to search for both articles and journals. The PLOS website also has resources for peer reviewers, including guidance on becoming a reviewer and on how to best participate in the peer review process. 

PubMed® comprises more than 38 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full text content from PubMed Central and publisher web sites.

You will access publications from AGORA (Enabling the developing world to access agriculture research), ARDI (Research for Innovation), GOALI (Enabling the developing world to access legal research), HINARI (Enabling the developing world to access health research, and OARE (Enabling the developing world to access environment research )

Research4life access : Please Contact the Librarian for Login Details

The ScienceGate goal is to support all scientific and educational communities to facilitate achieving their goals through the best path. The ScienceGate team tries to make this possible by providing and developing several unique services gathered in a web platform.

Functioning as a research and publishing network, ScienceOpen offers OA to more than 74 million articles in all areas of science. Although you do need to register to view the full text of articles, registration is free. The advanced search function is highly detailed, allowing you to find exactly the research you're looking for.

The Berlin- and Boston-based company was founded in 2013 to "facilitate open and public communications between academics and to allow ideas to be judged on their merit, regardless of where they come from." Search results can be exported for easy integration with reference management systems.

You can also bookmark articles for later research. There are extensive networking options, including your Science Open profile, a forum for interacting with other researchers, the ability to track your usage and citations, and an interactive bibliography. Users have the ability to review articles and provide their knowledge and insight within the community.

Collection: 74,560,631

Other Services: None

Good Source of Peer-Reviewed Articles: Yes

Advanced Search Options: Content type, source, author, journal, discipline

A unique and easy-to-use resource, Semantic Scholar defines itself not just as a research database but also as a "search and discovery tool." Semantic Scholar harnesses the power of artificial intelligence to efficiently sort through millions of science-related papers based on your search terms.

Through this singular application of machine learning, Semantic Scholar expands search results to include topic overviews based on your search terms, with the option to create an alert for or further explore the topic. It also provides links to related topics.

In addition, search results produce "TLDR" summaries in order to provide concise overviews of articles and enhance your research by helping you to navigate quickly and easily through the available literature to find the most relevant information. According to the site, although some articles are behind paywalls, "the data [they] have for those articles is limited," so you can expect to receive mostly full-text results.

Collection: 203,379,033

Other Services: Semantic Scholar supports multiple popular browsers. Content can be accessed through both mobile and desktop versions of Firefox, Microsoft Edge, Google Chrome, Apple Safari, and Opera.

Hosted by the University of Pennsylvania. An easily navigable central access for over 35,000 books hosted by the University of Pennsylvania; search by author, subject, or title for books on social sciences, political science, medicine, religion, history, education, music, and health.

The Social Science Research Network (SSRN) is an open access repository of scholarly research in the social sciences and humanities. SSRN is composed of a number of specialized research networks including Economics, Financial Economics and Legal Scholarship. The SSRN eLibrary database contains abstracts for scholarly articles, working papers and forthcoming papers, as well as over 390,000 downloadable full-text documents. EUI working papers in Economics and Law are also included in the SSRN eLibrary.

The World Bank Open Knowledge Repository

The World Bank Open Knowledge Repository (OKR) is The World Bank’s official open access repository for its research outputs and knowledge products.

The Office of Science provides links to key resources for the public to keep abreast of activities of our national laboratories and university research partners, to find more information about research sponsored by the Office, and to help in communicating stories about the discovery research we support.

 This Library Contains open access Online knowledge resources for capacity development

Zenodo, powered by the European Organization for Nuclear Research (CERN), was launched in 2013. Taking its name from Zenodotus, the first librarian of the ancient library of Alexandria, Zenodo is a tool "built and developed by researchers, to ensure that everyone can join in open science." Zenodo accepts all research from every discipline in any file format.

However, Zenodo also curates uploads and promotes peer-reviewed material that is available through OA. A DOI is assigned to everything that is uploaded to Zenodo, making research easily findable and citable. You can sort by keyword, title, journal, and more and download OA documents directly from the site.

While there are closed access and restricted access items in the database, the vast majority of research is OA material. Search results can be filtered by access type, making it easy to view the free articles available in the database.

Collection: 2,220,000+