Open Access Databases

SpringerOpen
https://link.springer.com/search?package=openaccess
SpringerOpen offer researchers from all areas of science, technology, medicine, the humanities and social sciences open access to journals and books. 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.

ScienceOpen
https://www.scienceopen.com/
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.

WorldWideScience
https://worldwidescience.org
WorldWideScience is a global academic search engine, providing access to national and international scientific databases from across the globe. One interesting feature is that it offers automatic translation, so users can have search results translated into their preferred language.

CORE
https://core.ac.uk
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.

DIRECTORY OF OPEN ACCESS JOURNALS (DOAJ)
https://doaj.org
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 17,193 journals, allowing you to either browse by subject or search by keyword.

arXiv e-PRINT ARCHIVE
https://arxiv.org
The arXiv e-Print Archive is run by Cornell University Library and curated by volunteer moderators, and it now offers OA to more than one million e-prints.

SOCIAL SCIENCE RESEARCH NETWORK (SSRN)
https://www.ssrn.com/index.cfm/en/
SSRN´s eLibrary provides 1,196,568 research papers from 1,185,029 researchers in more than 70 disciplines.

PUBLIC LIBRARY OF SCIENCE (PLOS)
https://plos.org
PLOS publishes a suite of influential Open Access journals across all areas of science and medicine. Rigorously reported, peer reviewed and immediately available without restrictions, promoting the widest readership and impact possible.

OpenDOAR
https://sherpa.ac.uk/opendoar/
OpenDOAR, or the Directory of Open Access Repositories, is a comprehensive resource for finding free OA journals and articles. Using Google Custom Search, OpenDOAR combs through OA repositories around the world and returns relevant research in all disciplines.

1E-Theses Online Service (EthOS)
https://ethos.bl.uk/Home.do
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.

Semantic Scholar
https://www.semanticscholar.org
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.

Bielefeld Academic Search Engine (BASE)
https://www.base-search.net
Another dedicated academic search engine, BASE offers access to more than 140 million documents from more than 6,000 sources. Around 60% of these documents are open access, and you can filter results to see only research that is available for free online.

BioMed Central (BMC)
Peer-reviewed open access journals spanning science, technology, engineering and medicine. BMC are dedicated to publishing the best open access journals across portfolio of over 250 titles and striving to drive progress in biology, health sciences and medicine.
 
PubMed Central
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). PubMed® comprises more than 37 million citations for biomedical literature from MEDLINE, life science journals, and online books.
 
BMJOpen
An online-only, open access general medical journal, dedicated to publishing medical research from all disciplines and therapeutic areas. The journal publishes all research study types, from protocols through phase I trials to meta-analyses, including small, specialist studies, and negative studies.

RESEARCH4LIFE
Research4Life provides access to 205,000 leading journals and books in the fields of health, agriculture, environment, applied sciences and legal information.
 
Europe PMC
Europe PMC contains 44.4 million abstracts and 9.9 million full text articles, including research articles, preprints, micropublications, books, reviews, and protocols. Europe PMC integrates content from a range of sources such as PubMed, PubMed Central (PMC), Agricola, and 32 life science preprint servers including biorxiv, Research Square, and Preprints.org.
 
PLOS
Open access publisher of peer-reviewed scientific and medical research. PLOS publishes a suite of influential Open Access journals across all areas of science and medicine. Rigorously reported, peer reviewed and immediately available without restrictions, promoting the widest readership and impact possible.
 
MedlinePlus
MedlinePlus is an online health information resource for patients and their families and friends. It is a service of the National Library of Medicine (NLM), the world’s largest medical library, which is part of the National Institutes of Health (NIH).
 
MEDLINE
MEDLINE is the National Library of Medicine’s (NLM) premier bibliographic database that contains references to journal articles in life sciences, with a concentration on biomedicine. This is a bibliographic database of life sciences and biomedical information. It includes bibliographic information for articles from academic journals covering medicine, nursing, pharmacy, dentistry, veterinary medicine, and health care.

HubMed
An alternative interface to the PubMed medical literature database
 
Global Index Medicus
The Global Index Medicus (GIM) provides worldwide access to biomedical and public health literature produced by and within low-middle income countries. The main objective is to increase the visibility and usability of this important set of resources. The material is collated and aggregated by WHO Regional Office Libraries on a central search platform allowing retrieval of bibliographical and full text information.
 
DrugBank
A unique bioinformatics and cheminformatics resource that combines detailed drug (i.e. chemical, pharmacological and pharmaceutical) data with comprehensive drug target (i.e. sequence, structure, and pathway) information. This project is supported by the Canadian Institutes of Health Research (award #111062), Alberta Innovates – Health Solutions, and by The Metabolomics Innovation Centre (TMIC).
 
Nigeria Centre for Disease Control and Prevention
The Nigeria Centre for Disease Control and Prevention (NCDC) is the national public health institute with the mandate to lead the preparedness, detection and response to infectious disease outbreaks and public health emergencies.