Here is a list of Research Paper Online Databases compiled by FYIcenter.com team:

arXiv Article Database - arXiv is a free distribution service and an open-access archive for nearly 2.4 million scholarly articles in many fields of science.

BMC (BioMed Central) - BMC offers access to about 300 peer-reviewed journals in biology, health sciences and medicine.

CiteSeer Database - CiteSeer is a public search engine and digital library for scientific and academic papers, primarily in the fields of computer and information science.

Crossref.org DOI Database - Crossref maintains a DOI database of all DOI entries registered by Crossref. As of April 9, 2020, Crossref's DOI database has about 112.5 million DOI entries.

DataCite.org DOI Database - DataCite provides DOI registration, search and API services.

The DBLP Computer Science Bibliography - DBLP is a computer science bibliography database created by Michael Ley in 1993. It is used as the on-line reference for bibliographic information on major computer science publications.

DOAJ (Directory of Open Access Journals - DOAJ is a collection of journal sources that users can access for free.

DOI API at doi.org - doi.org is the official Website for maintaining the DOI system. It also offers DOI URL redirect services.

FYIcenter.com Research Paper Database - FYIcenter.com provides a Research Paper search and download Web interface.

Google Scholar - Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines.

HathiTrust Digital Library - HathiTrust Digital Library is a large-scale collaborative repository of digital content from research libraries including content digitized via Google Books and the Internet Archive digitization initiatives.

IEEE Xplore Digital Library - IEEE Xplore provide access to metadata for more than 6 million documents including IEEE Journals, Conferences, Books, Courses, and Standards

ISSN Number for Publications - ISSN (International Standard Serial Number) is a unique code that identifies a serial or continuing resource, such as a journal, magazine, or online publication. ISSN was introduced in 1976, and is managed by the intergovernmental organization the ISSN International Centre.

JSTOR (Journal Store) - JSTOR provides access to more than 12 million journal articles, books, images, and primary sources in 75 disciplines.

The Lens Database - The Lens is a free searcheable online patent and scholarly literature database, provided by Cambia, an Australia-based non-profit organization.

LOC (Library of Congress) - LOC is a research library in Washington, D.C., serving as the library and research service for the United States Congress and the de facto national library of the United States.

OpenAlex Database OpenAlex is a bibliographic database of scientific papers, authors and institutions accessible in open access mode, named after the Library of Alexandria.

ORCID (Open Researcher and Contributor ID) ORCID, which stands for Open Researcher and Contributor ID, database offers Web portal and API on registered Researcher and Contributor IDs.

PubMed Central (PMC) Database - PubMed Central® (PMC) is a free full-text archive of biomedical and life sciences journal literature.

Sci-Hub Research Paper Database - Sci-Hub is a tool for providing quick access to articles from scientific journals with 88,343,822 entries.

ScienceDirect Website - ScienceDirect Database is a web-based bibliographic database, which provides access to full texts of scientific and medical publications of the Dutch publisher Elsevier as well of several small academic publishers.

Scopus Citation Database - Scopus is a scientific abstract and citation database, launched by the academic publisher Elsevier. Access requires paid subscriptions.

Semantic Scholar Database - Semantic Scholar offers a free and AI-powered research tool for scientific literature with over 200 millions papers of all fields of science.

Springer Nature Publisher - Springer Nature Publisher offers API to access metadata, images and articles of their books and journals.

Social Science Research Network (SSRN) - SSRN is a collection of papers from the social sciences community.

Unpaywall - Open Access Papers - Unpaywall hosts the oaDOI (Open Access DOI) database with millions of free scholarly articles.

Web of Science - The Web of Science, previously known as Web of Knowledge, is a paid-access database that provide reference and citation data from academic journals, conference proceedings, and other documents in various academic disciplines.

Wiley Online Library - Wiley Online Library is a multidisciplinary collection of online resources covering life, health and physical sciences, social sciences, and the humanities.

Other DOI Tools and Resources

 

⇒ arXiv Article Database

⇐ Research Paper Databases

⇑⇑ Research Paper Databases