Online databases

Wikidata is a collaboratively edited multilingual knowledge graph hosted by the Wikimedia Foundation. It is a source of open data released under the Creative Commons CC0 public domain dedication. It is for the use of both Wikimedia and external projects. Wikidata is a wiki powered by the software MediaWiki, including its extension for semi-structured data, the Wikibase. As of early 2025, Wikidata had 1.65 billion item statements (semantic triples).

PubMed is an openly accessible, free database which primarily includes the MEDLINE database of references and abstracts on life sciences and biomedical topics. The United States National Library of Medicine (NLM) at the National Institutes of Health maintains the database as part of the Entrez system of information retrieval.

database arm of the US National Library of Medicine

academic search service by Google

online database of Broadway theatre productions and their personnel

encyclopedia on the history of Switzerland

eMedicine is an online clinical medical knowledge base founded in 1996 by doctors Scott Plantz and Jonathan Adler, and computer engineers Joanne Berezin and Jeffrey Berezin. The eMedicine website consists of approximately 6,800 medical topic review articles, each of which is associated with a clinical subspecialty "textbook". The knowledge base includes over 25,000 clinically multimedia files.

Internet-based vexillological association and resource

KEGG (Kyoto Encyclopedia of Genes and Genomes) is a collection of databases dealing with genomes, biological pathways, diseases, drugs, and chemical substances. KEGG is utilized for bioinformatics research and education, including data analysis in genomics, metagenomics, metabolomics and other omics studies, modeling and simulation in systems biology, and translational research in drug development.

library catalog on the web

online subscription index of citations

thumb|120px|The Entrez logo The Entrez () Global Query Cross-Database Search System is a federated search engine, or web portal that allows users to search many discrete health sciences databases at the National Center for Biotechnology Information (NCBI) website. The NCBI is a part of the National Library of Medicine (NLM), which is itself a department of the National Institutes of Health (NIH), which in turn is a part of the United States Department of Health and Human Services. The name "Entrez" (a greeting meaning "Come in" in French) was chosen to reflect the spirit of welcoming the publi

UniProt is a freely accessible database of protein sequence and functional information, many entries being derived from genome sequencing projects. It contains a large amount of information about the biological function of proteins derived from the research literature. It is maintained by the UniProt consortium, which consists of several European bioinformatics organisations and a foundation from Washington, DC, US.

database of members of French Legion of Honour

thumb|Structurae logo

scientific journal

MEDLINE (Medical Literature Analysis and Retrieval System Online, or MEDLARS Online) 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. MEDLINE also covers much of the literature in biology and biochemistry, as well as fields such as molecular evolution.

bibliographic database (1996-)

CiteSeerX (often stylized as CiteSeer; formerly called CiteSeer) was a public search engine and digital library for scientific and academic papers, primarily in the fields of computer and information science.

online database

abstracting and reviewing service for mathematical literature

academic publishing service

online database of written speculative fiction and its creators

Online fashion related database

database of content that is a copy of content that is otherwise obscured or not accessible because of paywalls or other accessibility restrictions

Trove is an Australian online library database owned by the National Library of Australia in which it holds partnerships with source providers National and State Libraries Australia, an aggregator and service which includes full text documents, digital images, bibliographic and holdings data of items which are not available digitally, and a free faceted-search engine as a discovery tool.

taxonomic database

The Notable Names Database (NNDB) is an online database of biographical details of over 40,000 people. Soylent Communications, a sole proprietorship that also hosted the later defunct Rotten.com, describes NNDB as an "intelligence aggregator" of noteworthy persons, highlighting their interpersonal connections. The Rotten.com domain was registered in 1996 by former Apple and Netscape software engineer Thomas E. Dell, who was also known by his internet alias, "Soylent".

archive of space science data

former online bibliographic database, developed by Microsoft Research, shut down in 2022

Airliners.net is an aviation website that includes an extensive photo database of aircraft and airports, as well as a forum catering to aviation enthusiasts. Founded by Johan Lundgren, Jr. in Sweden, the site originated in 1996 as Pictures of Modern Airliners. It was acquired by the US company Demand Media (now known as Leaf Group) in 2007, and underwent a major redesign in 2016.

international bibliography of translated published works

database of songs that have been collected from oral tradition in the English language

open wiki to catalog food, nutrition facts and ingredients

Swiss theatre dictionary

central database maintained by the French Ministry of Culture

archINFORM is an online database for international architecture, originally emerging from records of interesting building projects from architecture students from the University of Karlsruhe, Germany.

SkyscraperPage is a website for skyscraper hobbyists and enthusiasts that tracks existing and proposed skyscrapers around the world. The site is owned by Skyscraper Source Media, a supplier of skyscraper diagrams for the publication, marketing, and display industries, and is a publisher of illustrated skyscraper diagram poster products. They are based in Victoria, British Columbia.

rapid alerting service database

thumb|right DailyMed is a website operated by the U.S. National Library of Medicine (NLM) to publish up-to-date and accurate drug labels (also called a "package insert") to health care providers and the general public. The contents of DailyMed is provided and updated daily by the U.S. Food and Drug Administration (FDA). The FDA in turn collects this information from the pharmaceutical industry.

database provided by Google containing various types of content

database for rollercoasters

online resource for names of butterflies and moths

PhilPapers is an interactive academic database of journal articles in philosophy. It is maintained by the Centre for Digital Philosophy at the University of Western Ontario, and it has "394,867 registered users, including the majority of professional philosophers and graduate students". The general editors are its founders, David Bourget and David Chalmers.

geographic name web service and database for British Columbia

Semrush Holdings, Inc. is an American public company that has a SaaS platform known as Semrush. The platform is used for keyword research, competitive analysis, site audits, backlink tracking, domain authority tracking, and online visibility insights. The keyword research tool provides various data points on each keyword. The platform also collects information about online keywords gathered from Google and Bing search engines. It was released by Boston-based company Semrush Inc, founded by Oleg Shchegolev and Dmitri Melnikov.

Artcyclopedia is an online database of museum-quality fine art founded by Canadian John Malyon.

catalogue and later database of references and abstracts on biology

OpenCorporates is a website that shares data on corporations under the copyleft Open Database License. The company, OpenCorporates Ltd, was incorporated on 18 December 2010 by Chris Taggart and Rob McKinnon, and the website was officially launched on 20th.

database of scientific illustrators active 1450–1950 and no longer alive

database of human proteins

'BacDive (The Bacterial Diversity Database') is the worldwide largest database for standardized bacterial and archaeal strain-level information.

thumb|upright=0.5|Screenshot of main page Lib.ru, also known as '''Maksim Moshkow's Library''' (, started to operate in November 1994) is the oldest electronic library in the Russian Internet segment.

Numbeo is a Serbian crowd-sourced online database of perceived consumer prices, real property prices, and quality of life metrics. The website was founded in April 2009 by former Google employee Mladen Adamović, to enable users to share and compare information about the cost of living between countries and cities. Since 2012, the website has been operated by NUMBEO DOO Beograd-Palilula, a Serbian private limited company run by Adamović. According to Adamović, the website earns money through advertising and the sale of subscriptions to its API.

Database of impact structures on Earth

citation index produced since 2015 by Thomson Reuters, and now by Clarivate Analytics

Pexels is a provider of stock photography and stock footage. It was founded in Germany in 2014 and maintains a library with over 3.2 million free stock photos and videos.

classmates.com is an American social networking service. It was founded on November 17, 1995 by Randy Conrads as Classmates Online, Inc. and headquartered in Bellevue, Washington. It bills itself as the leading online social network service in the United States for bringing high school alumni together, with over 90 million members.

OpenAlex is a bibliographic catalogue of scientific papers, authors and institutions accessible in open access mode, named after the Library of Alexandria. It started operating in January 2022 by OurResearch as a successor of the terminated Microsoft Academic Graph. OpenAlex competes with commercial products such as Clarivate's Web of Science or Elsevier's Scopus, and is complemented by bibliometrics tools and an API.

SeaLifeBase is a global online database of information about marine life. It aims to provide key information on the taxonomy, distribution and ecology of all marine species in the world apart from finfish. SeaLifeBase is in partnership with the WorldFish Center in Malaysia and the UBC Institute for the Oceans and Fisheries at the University of British Columbia. Daniel Pauly is the principal investigator and it is coordinated by Maria Lourdes D. Palomares. , it included descriptions of 85,000 species, 59,400 common names, 15,500 pictures, and references to 39,300 works in the scientific literat