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What A&I services exist?

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Around 200 companies and institutions currently offer A&I services, with a total of approx. 500 databases, ranging from scientific services covering all subject areas:

Web of Science (Thomson Reuters)
Scopus (Elsevier)
Google Scholar

and companies with dozens of, in some cases highly specialised, databases:


through to services focused on individual specialisms:

Chemical Abstracts Service
Index Theologicus
Philosopher's Index

and services dedicated exclusively to open access publications:

Directory of Open Access Journals (DOAJ)
Directory of Open Access Books (DOAB)

De Gruyter works together with all of these services and is constantly expanding its cooperation with new abstracting and indexing services.