Abstracting and indexing

The Directory of Open Access Journals (DOAJ) is a prominent, independent, and community-curated global database that indexes high-quality, peer-reviewed open access scholarly journals. Launched in 2003 by Lund University with just 300 journals, it is now maintained by the non-profit Infrastructure Services for Open Access (IS4OA).

Dimensions is a comprehensive, modern research database developed by Digital Science that automatically indexes scholarly literature and linked data. Unlike restrictive traditional databases, Dimensions heavily prioritizes open, machine-readable infrastructure to capture a much broader scope of global research.

EBSCO Information Services is a leading global provider of research databases, e-journals, e-books, and library discovery services. Headquartered in Ipswich, Massachusetts, it operates as a major division of EBSCO Industries. The company serves academic institutions, schools, medical centers, corporations, and public libraries worldwide.

Ei Compendex (Engineering Index Compendex) is the world's most comprehensive engineering literature database, hosted on Elsevier's Engineering Village platform.

Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across a wide array of publishing formats and academic disciplines. Launched by Google in November 2004, it serves as a massive repository for tracking academic research, publications, and citation metrics.

Inspec is a major indexing database of scientific and technical literature, published by the Institution of Engineering and Technology (IET), and formerly by the Institution of Electrical Engineers (IEE), one of the IET's forerunners.

Index Copernicus is an entity that is a 100% Polish brand. The aim of the company's activities is to support scientists and scientific units in managing the development of scientific potential, cooperation to create an adequate system for the evaluation of scientific publications in Poland, as well as assistance in building the competences of editors of national scientific journals.

OpenAlex is a free, open-source bibliographic catalog and knowledge graph that indexes global research data under a CC0 public-domain license. Launched in 2022 by the nonprofit organization OurResearch to succeed the defunct Microsoft Academic Graph (MAG), it serves as a massive open alternative to commercial databases like Web of Science and Scopus.

ProQuest is a global information-content and technology provider that serves as a massive digital gateway for academic, corporate, and library research. Founded in 1938 as University Microfilms, the Ann Arbor, Michigan-based company was acquired by Clarivate in 2021 for $5.3 billion to integrate its massive repository with the Web of Science platform.

ROAD is a free-access directory launched by the ISSN International Centre with the support of UNESCO. It provides a single point of access to a specific subset of the global ISSN Register: scholarly resources that are entirely Open Access (OA), including journals, academic blogs, conference proceedings, and repositories.