Open Access Journals Open Access Directories OA Databases OA Search Engines OA Aggregators Search Articles
1.Public Library of Science (PLOS)
PLOS is an open-access research organization that publishes several journals. But as well as publishing its own research, PLOS is a dedicated advocate for open-access learning. So if you appreciate the search engines and databases we’ve listed here, check out the rest of the PLOS site to find out more about their campaign to enable access to knowledge.
2. ScienceOpen
Functioning as a research and publishing network, offers open access to more than 28 million articles in all areas of science. Although you do need to register to view the full text of the articles, registration is free. The advanced search function is highly detailed, allowing you to find precisely the research you're looking for.
Science Direct Open Access Content
The arXiv e-Print Archive has been around since 1991 and resource in the fields of mathematics and computer science. It is run by Cornell University Library and now offers open access to more than one million e-prints.
4. Education Resources Information Center The https://eric.ed.gov/ (ERIC), of the Institution of Education Sciences, allows you to search by topic for material related to the field of education. Links lead to other sites, where you may have to purchase the information, but you can search for full-text articles only. The service primarily indexes journals, grey literature (such as technical reports, white papers, and government documents), and books. All sources of material on ERIC go through a formal review process prior to being indexed.
10. Digital Library of the Commons Repository Run by Indiana University, the site, http://dlc.dlib.indiana.edu/dlc/, (DLC) Repository is a multidisciplinary journal repository that allows users to check thousands of free and open access articles from around the world. You can browse by document type, date, author, title, and more or search for keywords relevant to your topic.
11. CIA World Factbook https://www.cia.gov/library/publications/the-world-factbook/geos/xx.html 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 highly useful 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, including information about history, geography, transportation, and much more.
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13. dblp Computer Science Bibliography The site, http://dblp.org/, is an online index of major computer science publications. Although it provides access to both free access articles and those behind a paywall, you can limit your search to only full-text articles. The site indexes more than three million publications, making it an invaluable resource in the world of computer science.
14. EconBiz https://www.econbiz.de/ is a great resource for economic and business studies. A service of the Leibniz Information Centre for Economics, it offers access to full texts online, with the option of searching for open access material only.
15. BioMed Central http://www.biomedcentral.com/ provides open access research from more than 290 peer-reviewed journals in the fields of biology, clinical medicine, and health. You can browse these journals by subject or title, or you can search all articles for your required keyword. 16. JURN A multidisciplinary search engine, http://www.jurn.org/#gsc.tab=0 provides you with links to various scholarly websites, articles, and journals that are all free access or open access. Specifically covering the fields of the arts, humanities, business, law, nature, science, and medicine, JURN has indexed almost 5,000 repositories to help you find exactly what you're looking for.
17. Dryad http://www.datadryad.org/ is a digital repository of curated, open access scientific research. It is run by a not-for-profit membership organization that aims to "promote a world where research data is openly available, integrated with the scholarly literature, and routinely reused to create knowledge." It is free to access but note that there is a publishing charge associated if you wish to publish your data in Dryad.
18. EThOS Run by the British Library, http://ethos.bl.uk/Home.do allows you to search over 400,000 doctoral theses in a variety of disciplines. 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.
19. PubMed https://www.ncbi.nlm.nih.gov/pubmed/, of the National Center for Biotechnology Information, is a very well-known research platform in the fields of science and medicine. It offers access to "more than 26 million citations for biomedical literature from MEDLINE, life science journals, and online books." While many resources are behind paywalls, you can filter your search to view free full texts only, making this an even more valuable resource.
20. Semantic Scholar A unique and easy-to-use resource, https://www.semanticscholar.org harnesses the power of artificial intelligence to efficiently sort through millions of science-related papers based on your search terms. 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. Another feature is the extensive advanced search options, which allow you to search by cell type and brain region, among other things.
21. Zenodo Taking its name from Zenodotus, the first librarian of the ancient library of Alexandria, https://zenodo.org/ is a tool that was "built and developed by researchers, to ensure that everyone can join in open science." You can sort by keyword, title, journal, and more and download open access documents directly from the site
Open Access Directories
Directory of Open Access Journals
A multidisciplinary, community-curated directory, gives researchers access to high-quality, peer-reviewed journals. It has archived more than two million articles from 9,519 journals, allowing you to either browse by subject or search by keyword. The site was launched in 2003 with the aim of increasing the visibility of open access scholarly journals. Content on the site covers subjects from science to law to fine arts and everything in between.
Resources: Research Papers
UPDATE Sci-Hub domain: