Semantic Scholar – Multidisciplinary
Is a free, AI-powered search and discovery tool that helps researchers discover and understand multidisciplinary scientific literature that’s most relevant to their work.
PubMed Central – Biomedical, life sciences
Is a free digital repository that archives open access full-text scholarly articles that have been published in biomedical and life sciences journals.
SSRN: Social Science Research Network – Social Sciences
Is a repository for preprints devoted to the rapid dissemination of scholarly research in the social sciences, humanities, life sciences, and health sciences, among others.Research papers from more than 55 disciplines
An open-access database for French researchers. Organized into institution and domain portals.
RePEc: Research Papers in Economics – Economics
Working papers, journal articles, books, books chapters and software components (including 1.2 million full-text articles)
ERIC: Educational Resource Information Center –Education
Is an online library of education research and information, sponsored by the Institute of Education Sciences (IES) of the U.S. Department of Education.
Pre-prints, mainly computer science, mathematics, statistics, chemistry, and biology.
Focus on scholarly content including full-text papers, conference proceedings, indexed journals, books, and book chapters from open access sources. Content is available in 38 languages, covering various subjects and disciplines. Zendy provides you with easy access to over 39 million scientific journals, e-books, and magazines with no download limits.
AGRIS: Agricultural database – Agriculture
Covers agriculture, forestry, animal husbandry, aquatic sciences and fisheries, human nutrition, extension literature from over 100 countries. Indexes unpublished scientific and technical reports, theses, conference papers, government publications.
iDAI.objects / Arachne – Archaeology, Art history
2.4 million digital images from archive material, 1 million of books, 40,000 high quality scans of ancient sculptures, 300 volumes of ancient books with more than 60,000 pages
Astrophysics Data System -Astrophysics, Geophysics, Physics
Publications in Astronomy and Astrophysics, Physics, and the arXiv e-prints. This is a digital library portal for researchers on astronomy and physics
BASE: Bielefeld Academic Search Engine – Multidisciplinary
Metadata for 260 million documents from more than 8,000 content providers
Directory of Open Access Journals -Multidisciplinary
DOAJ is a unique and extensive index of diverse open access journals from around the world, driven by a growing community and is committed to ensuring quality content is freely available online for everyone. It has access to articles from 18,652 open access journals
Directory of Open Access Books – Multidisciplinary
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.
EconBiz is an academic search portal for journals, working papers, and conferences in business studies and economics. It is provided by the ZBW – German National Library of Economics, Leibniz Information Centre for Economics. It Covers journals, working papers & conferences in business studies and economics
Google Scholar – Multidisciplinary
The biggest academic database & search engine (over 390 million records, unofficial estimate)
MEDLINE – Medicine, Healthcare
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).
MyScienceWork – Multidisciplinary
The database includes more than 90 million scientific publications and 12 million patents.
ScienceOpen – Multidisciplinary
Natural and physical sciences, social sciences, and humanities. Incorporates arXiv, PubMed, and SciELO. Integrated with ORCID Altmetric uids. Articles from >25,000 journals.
ZbMATH is a major reviewing service providing reviews and abstracts for articles in pure and applied mathematics, produced by the Berlin office of FIZ Karlsruhe – Leibniz Institute for Information Infrastructure GmbH.
A free archive of linguistics articles, with a focus on syntax, semantics, phonology and morphology
OpenAlex is a bibliographic catalogue of scientific papers, authors and institutions accessible in open access mode, named after the Library of Alexandria.