The ASHS EMC compiled a list of Open Access Online Resources that will definitely help you with your research. Open Access Online Resources are research materials that have been made available to the general public, free of charge: data and datasets, books, and articles, including scholarly research articles. Click on the images below to go to each site.
A multidisciplinary, community-curated directory, the Directory of Open Access Journals (DOAJ) 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. https://doaj.org/
Frontiers is a leading Open Access Publisher and Open Science Platform. Their journals are led and peer-reviewed by editorial boards of over 100,000 top researchers. Covering more than 600 academic disciplines, they are one of the largest and highest-cited publishers in the world. To date, their freely accessible research articles have received over 500 million views and downloads and 1 million citations. https://www.frontiersin.org/
The Education Resources Information Center (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. https://eric.ed.gov/
Project Gutenberg is a library of over 60,000 free eBooks. Choose among free epub and Kindle eBooks, download them or read them online. You will find the world's great literature here, with focus on older works for which U.S. copyright has expired. Thousands of volunteers digitized and diligently proofread the eBooks, for enjoyment and education. https://www.gutenberg.org/
Elsevier Open Access Journals about science have undergone peer-review, immediately free to access and download from ScienceDirect, and permitted to reuse defined by the author’s choice of Creative Commons user licenses. https://www.elsevier.com/
Scientific Research Publishing (SCIRP) is one of the largest Open Access journal publishers. It is currently publishing more than 200 open access, online, peer-reviewed journals covering a wide range of academic disciplines. SCIRP serves the worldwide academic communities and contributes to the progress and application of science with its publication. https://www.scirp.org/index.aspx
BioMed Central 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. https://www.biomedcentral.com/
CORE is a multidisciplinary aggregator of open access research. It allows users to search more than 66 million open access articles. While most of these link to the full-text article on the original publisher's site, five million records are hosted directly on CORE. https://core.ac.uk/
The dblp Computer Science Bibliography 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. https://dblp.org/
The Social Science Research Network (SSRN) is a collection of papers from the social sciences community. The site offers more than 700,000 abstracts and more than 600,000 full-text papers. https://www.ssrn.com/index.cfm/en/
EconBiz 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. https://www.econbiz.de/
Public Library of Science (PLOS) is a big player in the world of open access science. Publishing seven open access 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 open access, meaning that scientific articles are immediately and freely available to anyone, anywhere." https://plos.org/
Google Books is a service from Google Inc. that searches the full text of books and magazines that Google has scanned, converted to text using optical character recognition, and stored in its digital database. https://books.google.com/?hl=en
Google Scholar provides a simple way to broadly search for scholarly literature. From one place, you can search across many disciplines and sources: articles, theses, books, abstracts and court opinions, from academic publishers, professional societies, online repositories, universities and other web sites. https://scholar.google.com/