Bibliographic databases and indexes

Chemical Abstracts Service (CAS) is a division of the American Chemical Society.

PubMed is a free search engine accessing primarily the MEDLINE database of references and abstracts on life sciences and biomedical topics.

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.

Europe PubMed Central (Europe PMC) is an on-line database that offers free access to a large and growing collection of biomedical research literature.

GetCITED was a website database that listed publication and citation information on academic articles whose information was entered by members.

Mathematical Reviews (MR)is a journal and online bibliographic database published by the American Mathematical Society (AMS) that contains brief synopses (and occasionally evaluations) of many articles in mathematics, statistics and theoretical computer science.

The Répertoire International des Sources Musicales (RISM, English International Inventory of Musical Sources, German Internationales Quellenlexikon der Musik) is an international non-profit organisation, founded in Paris in 1952, with the aim of comprehensively documenting extant sources of music all over the world.

The Internet Speculative Fiction Database (ISFDB) is a database of bibliographic information on genres considered speculative fiction, including science fiction and related genres such as fantasy fiction and horror fiction.

Open Library is an online project intended to create "one web page for every book ever published".

WorldCat is a union catalog that itemizes the collections of 72,000 libraries in 170 countries and territories that participate in the Online Computer Library Center (OCLC) global cooperative.

Academic Search (ISSN 1097-0886, LCCN sn97001287) is a monthly indexing service.

The Technical Information Project (TIP) was an early database project.

Reed Technology and Information Services Inc.

Uchronia: The Alternate History List is an online general-interest book database containing a bibliography of over 2900 alternate history novels, stories, essays and other printed material.

Live Search Academic was a Web search engine for scholarly literature that existed from April 2006 to May 2008; it was part of Microsoft's Live Search group of services.

DBLP is a computer science bibliography website.

iDAI.objects arachne (short form: Arachne) is the central object-database (administrator: Reinhard Förtsch) of the German Archaeological Institute (DAI) and the Cologne Digital Archaeology Laboratory (CoDArchLab) at the University of Cologne.

Socolar is a free searchable database of open access journals, and repositories hosted by the China Educational Publications Import and Export Corporation (CEPIEC), one of the largest state-owned companies that was established in 1987 to meet the demands of foreign academic publications from universities and colleges in China.

Trove is an Australian online library database aggregator; a free faceted-search engine hosted by the National Library of Australia, in partnership with content providers including members of the National & State Libraries Australasia.

BASE (Bielefeld Academic Search Engine) is a multi-disciplinary search engine to scholarly internet resources, created by Bielefeld University Library in Bielefeld, Germany.

The Bibliography and Index of Geology is divided into Bibliography and index of North American geology and Bibliography and index of geology exclusive of North America.

Bibliographic Index was a metabibliography and bibliographic database published by the H.

Biography Index is a bibliographic index that indexes biographical information contained in books and magazines.

FindArticles was a website which provided access to articles previously published in over 3,000 magazines, journals, and other sources.

Australian Bibliographic Network is a national shared library cataloguing network that commenced in 1981 in Australia.

PubMed Central (PMC) is a free digital repository that archives publicly accessible full-text scholarly articles that have been published within the biomedical and life sciences journal literature.

Open J-Gate was a free database of open access journals, launched in February 2006, hosted by Informatics (India) Ltd.

The International Catalogue of Scientific Literature was an annual index covering scientific literature from all major areas of science.

The Philosopher's Information Center is a nonprofit, educational organization dedicated to serving the global philosophical community.

Dialog is an online information service owned by ProQuest, who acquired it from Thomson Reuters in mid-2008.

Hyper Articles en Ligne, generally shortened to HAL, is an open archive where authors can deposit scholarly documents from all academic fields.

The United States' National Science Digital Library (NSDL) is an open-access online digital library and collaborative network of disciplinary and grade-level focused education providers.

The International Catalogue of Scientific Papers was a bibliographic index of scientific literature that was published from 1901-1915, producing a total of 250 volumes.