201 Online Research Databases and Search Engines

Whether you are conducting extensive research for an academic program or simply interested in learning more about the world around you, online databases and search engines are a great way to study from the comfort of your home or dorm. That's why we've compiled a list of 202 websites and databases to help you do just that. While some require subscription or a library membership, many are open access, allowing you to find the data and information you need absolutely free of charge.

• Business and Economics
• Humanities, Social Sciences, Anthropology, Religion and Philosophy
• Mathematics and Computer Science
• Multidisciplinary
• Engineering and Agriculture
• Science and Medicine
• Military Studies
• Education, Linguistics and Law

Business and Economics

1. BPubs—BPubs is a search engine to access business and trade publications.
2. EconBiz—EconBiz focuses on economic and business studies, offering searches of all free access journals and open access material. Provided by the ZBW - German National Library of Economics, a part of the Leibniz Information Centre for Economics, the database opened in 2002 as the Virtual Library for Economics and Business Studies.
3. EconLit—This is a collection of 120+ years of economic research spearheaded by the American Economic Association. Focusing on literature in the field of economics, EconLit contains academic sources dating back to 1969.
4. EconStor—EconStor is a non-commercial public server by the ZBM with a large collection of economic literature, including 167,526 full texts. In contains open access full-text versions of working papers, journal articles and conference proceedings, all of which authors and editors can submit free of charge.
5. EDGAR Search—EDGAR Search is a searchable database offered by The U.S. Securities and Exchange Commission. Its purpose is to provide information and access to more than 21 million findings relating to SEC filings published, including operations and financial information searchable by company name.
6. IDEAS—IDEAS claims to be the largest bibliographic database dedicated to Economics that is available for free on the Internet. It is a volunteer effort to increase free dissemination of research in Economics and uses RePEc data. Authors who submit their work receive a monthly tally of its popularity, including its ranking on the database.
7. Inomics—Inomics is a search tool for jobs and academic programs in disciplines such as Economics, Business, Finance, Management and Marketing. You can also search by subject and curate a newsfeed of articles related to these disciplines.
8. National Bureau of Economic Research—The National Bureau of Economic Research offers this searchable database of working papers, books, chapters from books in progress, and other free publications related to research in Economics. Topics include themes such as: Africa, Charter Schools, Childhood Interventions, China's Economy, Commodity, Prices, Developments in the European Economy, Energy, Entrepreneurship, Immigration and Innovation, Inequality, International Capital Flows, Productivity and Growth, and Taxation.
9. Research Papers in Economics—Research Papers in Economics (RePEc) is a collaborative, volunteer project boasting archives containing 2.6 million research pieces from 3,000 journals and 4,600 working papers. Its purpose is to increase the dissemination of economic research.

Humanities, Social Sciences, Anthropology, Religion and Philosophy

10. AgeLine—The AgeLine database is a subscription-based online resource for gerontology research, and research relating to topics of aging. It is ideal for health organizations, government entities, and nursing service providers.
11. AllMusic—AllMusic is an online database cataloging more than 3 million albums and 30 million tracks. It also offers extensive information relating to bands and/or individual artists.
12. Anthropological Index Online—The Anthropological Index Online (AIO) is a service of the Royal Anthropological Institute (RAI) and supported by the Anthropology Library and Research Centre at the British Museum. It boasts approximately 4,000 periodical titles with content from various branches of anthropology, along with 800 journals, published in more than 40 languages.
13. Anthropological Literature—This subscription-based database offers indexing for anthropology and archaeology, including social and cultural anthropology, Old and New World archaeology, and physical anthropology.
14. Artcyclopedia—Artcylopedia is a database listing information about 9,000 artists and 2,900 art sites, and provides 160,000 links relative to the art world. It is searchable by artist, artwork, or museum location.
15. Arts & Humanities Citation Index—The Arts & Humanities Citation Index offers abstracts and indexing of 1,700+ journals published in the arts and humanities. With multiple subject categories, such as cultural studies, literature, and theater, the database is searchable by category or specific journal title.
16. ATLA Religion Database®—The ATLA Religion Database (ATLA RDB) is a subscription-based index, with journal articles, book reviews, and essays related to religion or religious studies. Published by the American Theological Library, the database contains 2.1 million article citations from over 1,940+ journals, along with over half a million book reviews.
17. Chinese Social Sciences Citation Index—Chinese Social Sciences Citation Index is based in China and developed by Nanjing University. It contains about 500 Chinese academic journals in the humanities and social sciences, and is used as basis for the evaluation of academic promotion among several universities.
18. Encyclopedia of Psychology—The Encyclopedia of Psychology is provided by Psych Central and offers links to various psychology topics and resources. It provides information on psychological conditions, tests, blogs and podcasts, clinical trials, academic resources, and forums and support groups.
19. Inspire—INSPIRE's main goal is to provide a repository for spatial information throughout Europe. This EU initiative seeks help to make spatial or geographical information accessible for those working in various stages of land development.
20. International Aging Research Portfolio—International Aging Research Portfolio (IARP) contains an open-access directory for grants, publications, and academic conferences in social and behavioral sciences. It also provides search and visual trend analysis tools for topics related to aging research.
21. International Directory of Philosophy—With over 37,000 listings, the International Directory of Philosophy database, established by the Philosophy Documentation Center in 2010, provides information on university philosophy departments, research centers, professional societies, journals, and philosophy.
22. L'Année philologique— L'Année philologique (The Philological Year) is a subscription-based database containing bibliography information for scholarly works in language, literature, history and culture of ancient Greece and Rome. The print version has been in publication since 1928.
23. Library of Anglo-American Culture & History—The Library of Anglo-American Culture & History, funded by the German Research Foundation, offers access to journals, newspapers, and databases in English Studies, American Studies, Canadian Studies, and Australian and New Zealand studies.
24. Literary Encyclopedia—The Literary Encyclopedia is a subscription-based database that publishes biographies of major and minor writers, as well as critical essays on literature, culture, and history.
25. National Criminal Justice Reference Service—The National Criminal Justice Reference Service offers this database through funding by the U.S. government. It is focused on content related to criminal justice and is a resource for law enforcement, policymakers, practitioners, and researchers. With its expansive collection of reports, books, research, and unpublished research, it is also valuable to educators, community leaders, and the general public.
26. OpenEdition.org—OpenEdition offers a searchable database of books and journals in the humanities and social sciences. Many are free access, along with services provided by libraries and subscribing institutions.
27. Open Library of Humanities—Open Library of Humanities is a registered charity in England and Wales and contains a searchable database of open access journals in the humanities.
28. PhilPapers—PhilPapers is a searchable database and bibliography of philosophy that is maintained by the community of philosophers. It includes various content in philosophy, including journals, books, open access archives, and personal pages, with 2,429,107 entries categorized in 5,408 categories.
29. Philosophy Research Index—The Philosophy Research Index offers bibliographic information on articles, books, reviews, dissertations, and other documents related to the field of philosophy. It includes over 1.34 million bibliographic records in 30 languages.
30. POPLINE—POPLINE provides free access to 380,000 publications and resources related to family planning and reproductive health, including many full-text copies.
31. Project MUSE—Project MUSE provides complete, full-text versions of scholarly journals. It contains over 674 journals from 125 publishers and offers over 50,000 books from more than 100 presses.
32. Psychology's Feminist Voices—Psychology's Feminist Voices (PFV) is a digital archive of past and contemporary feminist psychologists who have contributed to psychological research. It contains biographical profiles, oral history interview transcripts, video content, timelines, bibliographies, teaching resources, and an original 40-minute documentary on the current status of feminist psychology in the United States.
33. PsycINFO—PsycINFO, supported by the American Psychological Association, offers a searchable database containing abstracts and citations of literature that has been published in the field of psychology.
34. PubPsych—PubPsych is a searchable, open access database containing psychology-related resources. Users can search in English, Spanish, French and German.
35. Questia—Questia is an online research and paper writing resource with more than 94,000 online books. It also includes organizational and paper-writing tools to help manage research and automatically generate footnotes and bibliographies.
36. Rock's Backpages—Rock's Backpages is a subscription-based database that contains full-text articles that are freelance contributions to the music and mainstream press. It contains over 37,000 articles, including features, reviews, and 600 audio interviews with musicians.
37. Social Science Citation Index—Provided by Clarivate Analytics, the Social Science Citation Index contains approximately 3,000 leading academic journals across more than 50 disciplines.
38. Social Science Research Network—The Social Science Research Network (SSRN) offers 837,220 research papers from 416,090 researchers across 30 disciplines.
39. SocioSite—SocioSite is maintained by the University of Amsterdam and contains research related to sociological subjects, including activism, culture, peace, and racism.
40. SocioWeb—SocioWeb is a searchable database containing including websites, online directories, articles, surveys and statistics, and journals related to the study of sociology. It also contains links to sociological associations.
41. State Legislative Websites Directory—The National Conference of State Legislatures (NCSL) contains information gathered from the home pages and websites of the 50 state legislatures, the District of Columbia and the territories. Researchers can view bills, press rooms, and statutes from each state.
42. The Women's Library—The Women's Library is part of the London School of Economics and Political Science. It offers an online database of journals, articles, and cross-domain printed material, archives and 3D objects relating to women's history.
43. University of Oxford Text Archive—The Oxford Text Archive offers a searchable database of literary and linguistic resources for use in research and teaching. It is part of the CLARIN European Research Infrastructure and is part of the University of Oxford's contribution to the CLARIN-UK Consortium.
44. U.S. Metropolitan Travel Survey Archive—U.S. Metropolitan Travel Survey Archive is funded by The United States Department of Transportation and provides free access to travel surveys conducted by cities, states and localities.
45. VET-Bib—VET-Bib is a database offering bibliographic information for European vocational education and training (VET) literature and is maintained by the European Centre for the Development of Vocational Training (Cedefop).
46. WikiArc—WikiArc is a search tool for professionals, students and researchers interested in the fields of archaeology, classical antiquity, paleoanthropology, forensic anthropology, cultural heritage studies, and Quaternary sciences.

Mathematics and Computer Science

47. 2arXiv e-print Archive—Offered by Cornell University Library, arXiv.org is an open access database, allowing users to search for 1,480,478 e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance, Statistics, Electrical Engineering and Systems Science, and Economics.
48. Association for Computing Machinery Digital Library—The ACM Digital Library offers a searchable database of full-text Collection ACM publications, including journals, conference proceedings, technical magazines, newsletters and books.
49. Citebase Search—Citebase is the product of a collaboration between Opcit Project and the Open Archives Initiative. It is a cross-archive search engine that provides links to research paper bibliographies, along with generating citation analysis and navigation over the e-print literature.
50. CiteSeerX—CiteSeerx offers a searchable database and digital library of scientific literature focused primarily on computer and information science. It also provides resources such as algorithms, data, metadata, services, techniques, and software.
51. Collection of Computer Science Bibliographies—This searchable database offers bibliographies of computer science literature and contains more than 7 million references to journal articles, conference papers and technical reports in the field of computer science.
52. Computer Science Technical Reports—As a service offered by the computer science department of Virginia Tech, Computer Science Technical Reports is collection of computer science technical reports from CS departments and industrial and government research laboratories around the world.
53. dblp computer science bibliography—This searchable database offers open access bibliographic information academic journals within the computer science field. It is run by the University of Trier and Schloss Dagstuhl.
54. HCI Bibliography—The HCI Bibliography offers access to bibliographies, weblogs, columns, news, and developer resources related to human-computer interaction.
55. IEEE Xplore—Along with material published by the Institute of Electrical and Electronics Engineers (IEEE), the IEEE Xplore database provides access to more than 4.5-million documents related to the fields of computer science, electrical engineering, electronics. Full-text documents require a subscription.
56. Inspec—Inspec is run by the Institution of Engineering and Technology and provides access to 17 million abstracts in the fields of physics and engineering.
57. MathGuide—The MathGuide offers links to all core areas of mathematics, with the goal to index and catalog quality math resources and scholarly links.
58. The Collection of Computer Science Bibliographies—The Collection of Computer Science Bibliographies offers more than 7 million bibliographies (mostly to journal articles, conference papers and technical reports) of scientific literature in computer science from various sources, covering most aspects of computer science.
59. zbMATH—zbMath is a searchable database for finding documents, authors, and journals related to mathematics. While some are open access, others require payment.

Multidisciplinary

60. Academic Index—The Academic Index is a meta-search tool that indexes research-quality reference and information sources selected by professional librarians, educators, and educational and library consortia. It currently provides access to over 300,000 web pages.
61. Academic Search—Provided by EBSCO Publishing, the Academic Search database is a subscription-based research database providing access to peer-reviewed, full-text journals.
62. African Journals OnLine—African Journals OnLine (AJOL) offers access to peer-reviewed, African-published scholarly journals. Users can browse peer-reviewed journals from Africa, download full-text articles from journal homepages, and search for an article by title, author/s or keywords.
63. Airiti Inc—The Airiti Library provides a search platform in Chinese that features full-text academic journal articles, doctoral dissertations, and conference paper compilations.
64. Archives Hub—Archives Hub offers access to archives in over 300 institutions around Scotland, England, and Wales, providing links to digital content when available.
65. BASE: Bielefeld Academic Search Engine—Created and run by the Bielefeld University Library, BASE harvests metadata from institutional and other academic digital libraries. It offers over 120 million documents from across over 6000 sources with an easy-to-use search engine.
66. Book Review Index Online—Book Review Index Online offers access to book reviews from 1965 to the present published in nearly 500 periodicals and newspapers. You will need a New York Public Library card to access it free of charge.
67. Books in Print—Books in Print is a subscription-based service providing bibliographic information on published works to the book trade, including publishers, booksellers, libraries, and individuals.
68. Catalog of U.S. Government Publications—The CGP offers access to federal publications, including direct links to the full document, when available. Users can search by authoring agency, title, subject, and general keywords, or click on "Advanced Search" for more options.
69. CIA World Factbook—The World Factbook offers a searchable database on the history, people, government, economy, geography, communications, transportation, military, and transnational issues for 267 countries and locales around the world. References tools also available are maps of the major world regions, Flags of the World, a Physical Map of the World, a Political Map of the World, a World Oceans map, and a Standard Time Zones of the World map.
70. CiNii—CiNii (pronounced like "sigh-knee") is an open-access database offering access to articles, Books, Journals and Dissertations. It also includes university research bulletins or articles from the National Diet Library's Japanese Periodicals Index Database.
71. CiteULike—CiteULike provides free access, allowing users to store and share scholarly papers. The site extracts citations automatically from stored papers.
72. CogPrints—CogPrints is an an electronic archive for papers in Psychology, Neuroscience, and Linguistics, Computer Science, Philosophy, Biology, Medicine, and Anthropology.
73. CORE—CORE aggregates all open-access research from academic journals and entities worldwide, with the mission of making them available to the public.
74. De Gruyter Open—De Gruyter is an academic publisher of open access books, with more than 1000 open access books available on the website. Authors can also publish open access, although all publications are subject to peer review.
75. Digital Library of the Commons Repository—The DLC offers free and open access to articles (some full text), papers, and dissertations. There is also an author-submission portal; an Image Database; the Comprehensive Bibliography of the Commons; and a Keyword Thesaurus.
76. Directory of Open Access Journals—DOAJ is an online directory that is community curated and indexed to provide open access to peer-reviewed journals across multiple fields and topics.
77. EBSCO Open Dissertations—EBSCO Open Dissertations is a free database with more than 800,000 electronic theses and dissertations submitted globally.
78. EThOS—EThOS aims to improve the availability of doctoral research theses in the UK, making publicly-funded research freely available for all researchers.
79. Genamics JournalSeek—Genamics JournalSeek is a categorized database of freely available journal information, and currently contains information for 39,226 titles across disciplines. This information includes the journal's aims and scope, journal abbreviation, journal homepage link, subject category and ISSN.
80. GeoRef—Created by the American Geosciences Institute in 1966, the GeoRef database provides access to geoscience via a bibliographic database in the geosciences. It currently contains over 3.9 million references to geoscience journal articles, books, maps, conference papers, reports and theses.
81. Google Books—Google Books allows users to search through millions of books available online. If permission has been given, users can read the full text.
82. Google Correlate—Google Correlate is a part of Google Trends, allowing the user to submit a query for finding similar patterns to a target data series. Think of it as Google Trends in reverse.
83. Google Scholar—Google Scholar allows broad searches for academic literature across multiple disciplines, including articles, theses, books, abstracts and court opinions.
84. Google Trends—Google Trends offers searches that show how frequently a given search term is entered into Google's search engine relative to total search volume over a given period of time. It also provides geographical information about search engine users.
85. Indian Citation Index—The Indian Citation Index (ICI) database offers access to approximately 1000 top Indian scholarly journals across the sciences, social sciences, arts, and humanities.
86. Infotopia—Infotopia is an academic search engine that is curated by librarians, teachers and other educational workers.
87. Ingenta—The Ingenta Connect portal is a subscription-based content management system that hosts more than 5 million articles and 16,000 publications from 350 publishers.
88. International Medieval Bibliography—The International Medieval Bibliography (IMB) is a subscription-based database that offers current bibliographies of articles in journals related to Classics, English Language and Literature, History and Archaeology, Theology and Philosophy, Medieval European Languages and Literatures, Arabic and Islamic Studies, History of Education, Art History, Music, Theatre and Performance Arts, Rhetoric and Communication Studies.
89. iSEEK Education—iSEEK Education is a search engine that compiles thousands of authoritative resources from university and government sources.
90. J-Gate—J-Gate allows users to access global e-journal literature, including 10 Million full-text articles from 49,000+ journals covering Agriculture and biological Sciences, Arts and humanities, Basic Sciences, Biomedical Sciences, Engineering and Technology, and Social and Management Sciences.
91. JSTOR—JSTOR provides access for researchers and students to more than 12 million academic journal articles, books, and primary sources across 75 disciplines.
92. JURN—JURN provides an academic search-engine, indexing 3,952 free e-journals in the arts and humanities.
93. Library of Congress—The U.S. Library of Congress Online Catalog provides access to dozens of recommended free databases, indexing and abstracting services, and full-text reference resources in the Arts and Humanities, Law, News and Current Events, Regional and Cultural Studies, Science and Technology, and Social Sciences.
94. Mendeley—Mendeley allows researchers to add papers directly from their browser and generate references, citations and bibliographies across various formats. Researchers can also share ideas and discover new research in their field.
95. Microsoft Academic Search—Microsoft Academic Search allows users to search for papers and provides related information about the most relevant authors, institutions, publication outlets, and research areas through a semantic search capability.
96. National Archives—The National Archives provides a searchable archival database for U.S. government and veterans records, along with America's Founding documents, Educators' resources, and war records.
97. OAIster—The OAIster database provides millions of records from open access resources, and was built through harvesting from worldwide open access collections using the Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH).
98. OpenDOAR—OpenDOAR is a global directory of academic repositories that are open access, enabling users to identify, browse, and search for repositories.
99. OpenSIGLE—OpenSIGLE offers open access to 700,000 bibliographical references, including technical or research reports, doctoral dissertations, conference papers, official publications, and other types of grey literature.
100. Oxford Academic Journals—Oxford Academic is a service provided by Oxford University Press, publishing more than 200 open-access academic journals.
101. Paperity—Paperity is a multi-disciplinary aggregator of open-access journals, giving readers easy access to thousands of journals from hundreds of disciplines, in one central location. It includes scholarly communication in all research fields, from Sciences, Technology, Medicine, to Social Sciences, to Humanities and Arts.
102. Readers' Guide Retrospective: 1890–1982—Readers' Guide Retrospective: 1890-1982 is a subscription-based index of over three million articles from more than 550 leading magazines including full coverage of the original print volumes of Readers' Guide to Periodical Literature.
103. Readers' Guide to Periodical Literature—Readers' Guide to Periodical Literature is a subscription-based index covering topics in art, business, education and entertainment.
104. RefSeek—Refseek is a search engine that pulls from over one billion web pages, encyclopedias, journals and books, providing easy access to PDFs of academic papers.
105. ResearchGate—ResearchGate is part publication index/part networking site for scientists and researchers. It offers free access to over 15 million members from all over the world to share, discover, and discuss research.
106. SafetyLit—SafetyLit offers indexed reports from researchers who work in disciplines related to preventing and researching unintentional injuries, violence, and self-harm. These include agriculture, anthropology, architecture, economics, education, engineering specialties, ergonomics and human factors, faith scholars, health and medicine, law and law enforcement, psychology, social work, sociology, and other fields.
107. Scientific Electronic Library Online—SciELO (Scientific Electronic Library Online) is an open-access bibliographic database, digital library, and cooperative electronic publishing model for journals. It is available in English, Portuguese and Spanish.
108. SCIndeks—SCIndeks is a hybrid open-access and subscription-based database containing metadata and citation data for scientific publishing in Serbia, including some full-text articles.
109. Scopus—Scopus is the largest subscription-based abstract and citation database of peer-reviewed literature, including scientific journals, books and conference proceedings.
110. SearchTeam.com—SearchTeam is a collaborative search engine that allows you to conduct searches along with your friends, colleagues and coworkers.
111. Smithsonian Institution Research Information System—The Smithsonian Collections Search Center is an online database offering access to most of the major collections from Smithsonian museums, archives, libraries, and research units. It contains 13.5 million catalog records in Art & Design, History & Culture, and Science & Technology with over 3.1 million images, videos, audio files, podcasts, blog posts and electronic journals.
112. Socolar—Socolar is a searchable database containing open-access content from journals in Agriculture and Food Sciences, Arts and Architecture, Biology and Life Sciences, Business and Economics, Chemistry, Earth and Environmental Sciences, General Works, Health Sciences, History and Archaeology, Languages and Literatures, Law and Political Science, Mathematics and Statistics, Philosophy and Religion, Physics and Astronomy, Science, Social Sciences, Technology and Engineering, and Library and Information Science.
113. Sparrho—Sparrho combines human and artificial intelligence to complement traditional methods of finding academic material.
114. The British Library Catalogues & Digital Collections—The British Library offers multiple digital collections, including digitized manuscripts, sounds online, the endangered archives programme, and the British newspaper archive (among others).
115. Ulrichsweb—Ulrichsweb is a subscription-based database that helps librarians and subscribers avoid gathering serials information in bits and pieces from multiple sources, and brings together the latest bibliographic and provider details in one location.
116. Virtual Learning Resources Center—The Virtual Learning Resources Center (VLRC) hosts thousands of scholarly websites selected by teachers and librarians from around the world.
117. Wiley Online Library—The Wiley Online Library hosts one of the world's most extensive multidisciplinary, open-access collections of online resources covering life, health and physical sciences, social science, and the humanities. It contains over 4 million articles from 1,500 journals, 9,000 books, and hundreds of multi-volume reference works, laboratory protocols and databases.
118. Wolfram Alpha—Wolfram Alpha is a computational knowledge engine that provides answers for questions across a wide range of disciplines and knowledge.
119. WorldCat—WorldCat is the world's largest network offering access to library content and services. Some resources may require library membership to access.
120. Zenodo—Zenodo is a shared research database featuring topics in the Sciences and Humanities. Users can also create and curate communities for a workshop, project, department, journal, or digital repository.

Engineering and Agriculture

121. Abandoned & Little-Known Airfields—This site offers information on vanished or abandoned U.S. airfields and their unusual histories, searchable by state.
122. Aerospace & High Technology Database—This database requires Princeton University or ProQuest authentication to access. It covers all aspects of applied research in the aerospace and space sciences, providing indexing and abstracts from periodicals, conference papers, trade journals, magazines, books, patents and technical reports dating back to the early 1960s.
123. AGRICOLA: Agricultural Online Access—Run by the United States Department of Agriculture, this database is produced by the National Agricultural Library (NAL) and consists of two subsets of records: the first, including citations for journal articles that include abstracts; and the second, including bibliographic records describing monographs, serials, audiovisual materials and online content from around the world.
124. AGRIS—Run by the Food and Agriculture Organization of the United Nations, AGRIS offers a searchable database of papers, data, statistics, and multimedia material related to Agricultural Science and Technology Information.
125. ASCE Library—The ASCE Library offers a searchable database of civil engineering content, with articles from ASCE journals, papers from conference proceedings, and e-books and standards compiled by the American Society of Civil Engineers.
126. CAB Abstracts—CAB Abstracts is a subscription-based international bibliographic database focusing on agricultural literature and containing over 9.1 million records (from 1973 onward). It contains subjects relating to agriculture, environment, forestry, veterinary sciences, applied economics, food science, nutrition, and allied disciplines in the life sciences.
127. Civil Engineering Database—Run by the American Society of Civil Engineers, the Civil Engineering Database offers an open-access bibliographic database for all ASCE publications including journals, conference proceedings, books, standards, manuals, magazines, and newspapers related to civil engineering.
128. Ei Compendex—Ei Compendex is subscription-based and claims to be the broadest and most complete engineering literature database available in the world, providing peer reviewed and indexed publications with over 20 million records from 77 countries across 190 engineering disciplines.
129. FSTA – Food Science and Technology Abstracts—This subscription-based database covers literature on every aspect of the food chain, including biotechnology, microbiology, food safety, additives, nutrition, packaging and pet foods.
130. National Agricultural Library: Ag Data Commons Beta—The National Agricultural Library's Ag Data Commons Beta offers online access to open data relevant to agricultural research, including agronomy, genomics, hydrology, soils, agro-ecosystems, sustainability science, and economic statistics.
131. National Agricultural Library: PubAg—The National Agricultural Library's PubAg offers online access to 82,670 full-text journal articles on the agricultural sciences.

Science and Medicine

132. Analytical Sciences Digital Library—The Analytical Sciences Digital Library (ASDL) is funded by NSF's National Science Digital Library (NSDL) program and is a database containing peer reviewed innovations in curricular development and supporting technical resources in the analytical sciences.
133. Analytical Abstracts—Analytical Abstracts keeps users up to date regarding recent developments in analytical science, with a searchable updates that consists of article abstracts and details of analyte, matrix and technique.
134. Astrophysics Data System—The SAO/NASA Astrophysics Data System (ADS) is a searchable database for researchers in Astronomy and Physics, and is maintained by the Smithsonian Astrophysical Observatory (SAO) under a NASA grant. It contains three bibliographic databases comprised of more than 14.2 million records covering publications in Astronomy and Astrophysics, Physics, and the arXiv e-prints.
135. Behavioral and Brain Sciences—Behavioral and Brain Sciences is a database containing psychology and brain science articles.
136. Beilstein database—The Beilstein database is a subscription-based database of organic chemistry compounds, with over 6,000,000 structures and about 5,000,000 reactions. It is advertised as being the largest database in the field of organic chemistry.
137. Bioline International—Bioline is maintained by librarians and researchers, and provides a platform for the distribution of peer-reviewed journals in bioscience. Its content is currently from Bangladesh, Brazil, Chile, China, Colombia, Egypt, Ghana, India, Iran, Kenya, Malaysia, Nigeria, Tanzania, Turkey, Uganda and Venezuela.
138. Biological Abstracts—Biological Abstracts is a subscription-based database containing a collection of bibliographic references for life science and biomedical research literature.
139. BioMed Central—BioMed Central is an open-access, searchable database with an evolving portfolio of high-quality peer-reviewed journals in topics pertaining to biology, physical sciences, mathematics and engineering disciplines.
140. BioOne—BioOne is a nonprofit publisher providing libraries with cost-effective access to high-quality, curated research in science.
141. CancerData—CancerData.org offers open-access data related to cancer research.
142. CAplus—CAplus is a subscription-based integrated source of journal articles and patent documents in biomedical sciences, chemistry, engineering, materials science, agricultural science and more.
143. CAS Registry—CAS Registry is a database of inorganic and organic substances including minerals, compounds, alloys, mixtures, polymers, and salts. It is used primarily to identify unknown chemical substances using information about names and chemical structure of substances.
144. CERN Document Server—The CERN Document Servicer is an open-access database offering a digital collection of particle physics and accelerator physics preprints, articles, journals, photographs and more, from the CERN research center.
145. CHBD: Circumpolar Health Bibliographic Database—The Circumpolar Health Bibliographic Database (CHBD) is a project of the Canadian Institutes of Health Research (CIHR) Team in Circumpolar Health Research. It is a free electronic database containing 7900 records describing publications about all aspects of human health in the circumpolar region.
146. ChemBioFinder—ChemBioFinder is a free database containing data, articles and research related to Chemistry.
147. Chemisches Zentralblatt—Chemisches Zentralblatt is the first and oldest abstracts journal published in the field of chemistry, covering chemical literature from 1830 to 1969.
148. CINAHL (Cumulative Index to Nursing and Allied Health Literature)—The CINAHL is a subscription-based database offering fast and easy full-text access to top journals, evidence-based care sheets, quick lessons and more in the fields of Nursing and Allied Health.
149. Cochrane Library—The Cochrane Database of Systematic Reviews (CDSR) is a database offering systematic reviews in health care.
150. Current Contents – Science Edition—Current Contents is a subscription-based database that provides access to tables of contents, bibliographic information, and abstracts from issues of leading scholarly journals in Life Sciences; Clinical Medicine; Agricultural, Biological and Environmental Sciences; Engineering, Technology, and Applied Sciences; and Physical, Chemical and Earth Sciences.
151. Dryad—Dryad is an open repository for data whose vision is to promote a world where research data is openly available, integrated with the scholarly literature, and routinely re-used to create knowledge.
152. Elsevier Open Access Journals—Elsevier Open Access Journals provides articles in open-access, Elsevier-published journals that have undergone peer review and are permanently free for everyone to read and download.
153. EMBASE for Excerpta Medica database—Embase is a biomedical and pharmacological bibliographic database to search and access published literature for complying with the regulatory requirements of a licensed drug.
154. Europe PMC—Europe PMC is a repository, providing access to articles in life sciences, as well as books, patents and clinical guidelines.
155. Global Health—The Global Health database is subscription-based, and focused on research related to community and international health.
156. Global Health Archive—Global Health Archive is a database for researchers interested in public health and biomedical studies produced between 1910 and 1983. It includes over 800,000 records and provides data related to communicable diseases, nutrition, entomology, helminthology, and mycology.
157. Golm Metabolome Database—The Golm Metabolome Database (GMD) allows users to search for and disseminate information on mass spectra from biologically active metabolites quantified using gas chromatography (GC) coupled to mass spectrometry (MS).
158. HighWire—HighWire offers links to several online journals in the sciences, many of which are open access.
159. HubMed—HubMed is an alternative, third-party interface to PubMed, a database offering bibliographical information for biomedical literature produced by the National Library of Medicine.
160. IARP—The IARP offers a searchable database for literature and research on aging studies for research investigators, health care policy makers, government officials, interest groups and the general public.
161. Index Copernicus—Index Copernicus is a database containing user-contributed information in the sciences, including scientist profiles, scientific institutions, publications and research projects.
162. MathSciNet—MathSciNet is a searchable database of reviews, abstracts and bibliographic information for mathematical sciences literature. The database contains almost 3 million items and over 1.7 million direct links to original articles.
163. MEDLINE—MEDLINE provides bibliographical information, journal citations and abstracts for globally produced biomedical literature.
164. MedlinePlus—MedlinePlus offers searchable information on the latest treatments, drugs or supplements, and links to the latest medical research and clinical trials.
165. The Merck Index Online—The Merck Index Online provides a searchable database of medication by compound names, chemical structures, physical and biological activity and properties.
166. Meteorological & Geoastrophysical Abstracts—Meteorological & Geoastrophysical Abstracts (MGA) provides a searchable database of literature covering topics in meteorology, climatology, atmospheric chemistry and physics, astrophysics, hydrology, glaciology, physical oceanography and environmental sciences.
167. MyScienceWork—MyScienceWork's open-access feature allows users to search across 8,000 full-text documents in the field of science.
168. OASIS—The Open Access Series of Imaging Studies (OASIS) provides free neuroimaging data sets of the brain to the scientific community.
169. Organic Research Database—This website is a database of abstracts dealing with scientific research involving organic agriculture. It can only be accessed through a subscription.
170. OSTI.gov: Department of Energy Scientific and Technical Information—OSTI.GOV is run by the U.S. Department of Energy and offers a searchable database for science, technology, and engineering.
171. PolarisOS—PolarisOS is a scientific database including over 70 million scientific publications. It is designed to help scientists of all disciplines access and deposit scientific publications.
172. PubChem—PubChem is a National Institute of Health open database for Chemistry. It is designed to help scientists and the public access information about chemical structure, chemical/physical properties, identifiers, patents, biological activities and safety.
173. Public Library of Science—The Public Library of Science is a nonprofit scientific publishing and advocacy website with over 215,000 peer-reviewed scientific articles. The free articles span the subjects of Biology, Genetics, Pathogens, Medicine, and Tropical Diseases and can be redistributed.
174. PubMed—Pubmed is a collection of more than 29 million biomedical citations from online books, MEDLINE, and journals of life science. Some citations have links to full articles.
175. Retina—This journal features the latest information concerning vitreoretinal disorders, focusing on therapeutic and diagnostic techniques. It features full review articles twelve times a year.
176. Russian Science Citation Index—Russian Science Citation Index is a bibliographic database of scientific publications published in Russian.
177. ScienceDirect—Science Direct is a large collection of Engineering and Physical Science publications. The articles range from theoretical to applied science covering both foundational and research-based disciplines.
178. Science.gov—The website is a collection of 60 databases concerning federal science information. The databases allow users to access over 2,200 websites concerning scientific research and development.
179. ScienceOpen—ScienceOpen is a free Science research, publishing and networking platform with access to over 50 million articles. The website features research database access, social sharing and peer review.
180. Scientillion—Scientillion is a search engine that provides access primarily to articles concerning Physics and Computer Science. It also allows access to e-prints of scientific papers from various fields such as Astronomy, Biology and Mathematics.
181. SciSeek—SciSeek is a science search engine and directory in which users can browse by category, search by keyword, or add new sites to the listings.
182. SciTech Connect—SciTech Connect is a website that features a database of over 3 million research articles from the Department of Energy Office of Scientific and Technical Information.
183. Scopus—Scopus is a subscription-based abstract and citation database covering approximately 36,377 titles from 11,678 publishers in the fields of life sciences, social sciences, physical sciences and health sciences.
184. Semantic Scholar—Semantic Scholar is a collection of peer-reviewed scientific research articles. The website features access to over 40 million papers from sources such as PubMed, Nature, and ArXiv.
185. SPRESI—Spresi is an integrated scientific chemical database. It features 700,000 references, 4.6 million reactions, and 5.8 molecules that have been abstracted from the literature.
186. SpringerLink—SpringerLink provides researchers with access to millions of scientific documents from journals, books, series, protocols and reference works.
187. Strategian Science—Strategian is a free database to find resources in science, including full-text books, patents, and reports, as well as full-text journal and magazine articles.
188. Tropical Diseases Bulletin—The tropical diseases bulletin is a database with abstracts and bibliographic information. It is primarily concerned with research on public health and infectious diseases in the developing world.
189. Web of Science—Web of Science is a platform that connects the web of science core collection to patent data, an index of specialized subjects and research data sets. It accesses articles from over 33,000 journals.
190. WorldWideScience.org—WorldWideScience.org is a gateway to both international and national science databases. The goal of the site is to promote scientific progress and discovery by providing one platform to access international science databases.
191. VADLO—VADLO is a search engine for the purpose of accessing life science methods, protocols, and techniques. It gives access to a wide range of life science topics including biochemistry, genetics, and biotechnology.
192. Zoological Record—Zoological Record is considered to be the oldest existing database of animal Biology. It is a leading taxonomic reference, a register of animal names, and covers a wide variety of subjects such as taxonomy, veterinary science, biodiversity, and the environment.

Military Studies

193. Air University Library Index to Military Periodicals—Air University Library Index to Military Periodicals is a searchable, open-access database offering bibliographic and full-text information for military books and journal articles.
194. Fold3—Fold3 offers access to military records, including the stories, photos, and personal documents of the men and women who currently serve, or have served, in the U.S. military.

Education, Linguistics and Law

195. Digital History—Digital History is provided by the College of Education at the University of Houston and its purpose is to help teachers of American History in K-12 schools and colleges. It includes learning modules with historical overviews, along with recommended documents, films, historic images, lesson plans, fact checks, and guided student activities.
196. Education Resources Information Center—Education Resources Information Center (ERIC) offers a searchable digital library of full-text research and bibliographic information in the field of education, and is run by the Institute of Education Sciences (IES) of the U.S. Department of Education.
197. Lesson Planet—Lesson Planet is a membership-based database providing curriculum tools and lesson plans to K-12 educators, librarians, curriculum and technology specialists, and homeschooling parents.
198. LexisNexis—LexisNexis Academic allows users to search and access full-text news, business, and legal publications. It is available in over 1,800 libraries around the world.
199. LingBuzz—Lingbuzz is an archive that is freely accessible and offers linguistics articles, along with articles focusing on the latest research in syntax, semantics, phonology, morphology and more.
200. VET-Bib—VET-Bib is a bibliographic database offering literature and information focused on vocational education and training in Europe.
201. Westlaw—Westlaw is a subscription-based online legal research database providing a comprehensive collection of legal information, backed by a rigorous editorial process.