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The Institute for Scientific Information (ISI) was founded by Eugene Garfield in 1960. It was acquired by Thomson Scientific & Healthcare in 1992,[citation needed] became known as Thomson ISI and now is part of the Healthcare & Science business of the multi-billion dollar Thomson Reuters Corporation.

ISI offered bibliographic database services. Its specialty: citation indexing and analysis, a field pioneered by Garfield. It maintains citation databases covering thousands of academic journals, including a continuation of its longtime print-based indexing service the Science Citation Index (SCI), as well as the Social Sciences Citation Index (SSCI), and the Arts and Humanities Citation Index (AHCI). All of these are available via ISI's Web of Knowledge database service. This database allows a researcher to identify which articles have been cited most frequently, and who has cited them.

C.E.E.O.L. is an online archive which provides access to full text PDF articles from 613 humanities and social science journals and re-digitized documents pertaining to Central, Eastern and South-Eastern European topics.

EBSCOhost databases and discovery technologies are the most-used, premium online information resources for tens of thousands of institutions worldwide, representing millions of end-users.

ProQuest's family of brands provides electronic and microform information products and services to academic, school, public, corporate, and government libraries around the world. ProQuest provides seamless access to and navigation of more than 125 billion digital pages of the world's scholarship, delivering it to the desktop and into the workflow of serious researchers in multiple fields, from arts, literature, and social science to general reference, business, science, technology, and medicine.