- PKP/INDEX (Public Knowledge Project).
- BASE (Bielefeld Academic Search Engine).
- Journals Portal CAPES/MEC (Coordination of Improvement of Higher Level Personnel/Ministry of Education of Brazil).
- ERIH PLUS (European Reference Index for the Humanities and Social Sciences).
- LatinREV (Latin American Network of Academic Journals in Social Sciences and Humanities – Latin American Faculty of Social Sciences, FLACSO).
- OAI-PMH (Open Archives Initiative – Protocol for Metadata Harvesting).
- SUDOC (Le catalogue du Système Universitaire de Documentation).
- OpenAIRE
- Zenodo
- Copac National, Academic and Specialist Library Catalogue
- The Open Access Digital Library – Colorado Alliance of Research Libraries
- Crossref Metadata Search
- Catalogue Collectif de France
- Government of Canada – Federal Science Library (FSL).
- World Wide Science
- ScienceResearch.com
- Biblioteca do Conhecimento online
- Labordoc (International Labour Organization Library).
- Open Science Directory – EBSCO
- 1findr
- EUROPUB – Directory of Academic and Scientific Journals
- Scilit
- Academiko
- Wikidata
- The Knowledge Network
- MIAR (Information Matrix for the Analysis of Journals).
- LATINDEX (Regional Cooperative Online Information System for Scholarly Journals from Latin America, the Caribbean, Spain and Portugal).
- CIRC EC3metrics (Integrated Classification of Scientific Journals).
- SCIPEDIA
- CARHUS Plus+
- Google Scholar
- Scientific Journal Impact Factor – SJIF
- International Innovative Journal Impact Factor (IIJIF)
- wizdom.ai
- Scientific Indexing Services – SIS
- SIGEVA
- REDIB (Ibero-American Network of Innovation and Scientific Knowledge).
- DIALNET (University of La Rioja, Spain).
- ROAD (Directory of Open Access Scholarly Resources).
- DOAJ (Directory of Open Access Journals).
- ResearchBib (Academic Resource Index).
- ReefSeek
- LivRe. Revistas de livre acesso
- Actualidad Iberoamericana. Indice internacional de Revistas.
- Latinoamericana (Asociacion de Revistas Academicas de Humanidades y Ciencias Sociales).
- Amelica
- Hispana
- IAMCR
- Dardo
- Dimensions
- ALICIA – CONCYTEC
- CLASE. Citas Latinoamericanas en Ciencias Sociales y Humanidades
- Mir@bel
- EBSCO Fuente Académica Plus
- Sherpa Romeo
- CRUE (Spanish Universities. Library Network REBIUN).
- Regensburger Katalog (Universität Regensburg).
- WorldCat (OCLC).
- GIGA (German Institute of Global and Area Studies – Information Centre, Hamburg).
- Zeitschriftendatenbank – ZDB (German Union Catalogue of Serials).
- Elektronische Zeitschriftenbibliothek (EZB).
- SeAMK-Finna (Seinäjoki University of Applied Sciences Library’s search service).
- SUNCAT (Serials Union Catalogue for the UK research community).
- MLibrary (University of Michigan).
- Exalead (Quaero, European Union).
- Ibero-Amerikanisches Institut – Preußischer Kulturbesitz
- Orbis – Yale University Library Catalog
- American University of Sharjah – University Library
- University of Pretoria
- Maastricht University Library
- Erasmus University Rotterdam
- University of North Carolina Charlotte Libraries
- Universidad de Navarra
- Franklin College – Indiana
- Universidad de Valencia – TROBES: catàleg de la biblioteca
- Bishop Grosseteste University – UK
- Muhlenberg College – Pennsylvania
- Franklin & Marshall College – Pennsylvania
- The University of Manchester – Library Search
- The University of Sheffield – Star Plus University Library Discovery
- Catàleg Col·lectiu de les Universitats de Catalunya
- Université Toulouse 1 Capitole – Archipel
- Columbia University Libraries – New York
- Harvard Library – HOLLIS
- Toronto Public Library
- Leibniz Information Centre for Science and Technology University Library (TIB).
- University of California – Santa Barbara Library
- University of Victoria (Canada).
- CIRBIC (Catálogos Informatizados de la Red de Bibliotecas y Archivos del CSIC).
- Catálogo CISNE (Biblioteca Universidad Complutense de Madrid).
- FAMA – Universidad de Sevilla
- JABEGA – Universidad de Málaga
- Universitäts Bibliothek Wien
- New York University Libraries
- Uottawa Library
- Queen´s Library Catalogue
- Boise State University
- UNC University Library
- University of Cambridge
- James Madison University
- The University of Tennessee at Chattanooga – UTC Library
- West Virginia State University
- Princeton University Library
- UNED Biblioteca
- Universidad de Granada
- Standford University
- Biblioteca Electrónica de Ciencias y Tecnología – Argentina
- Sir Alex Ferguson Library – Glasgow Caledonian University