OpenAlex

OpenAlex is a platform that collects and standardizes data from various sources.  The two most important data sources are MAG (Microsoft Academic Graph), which is a large database of scholarly publications and related information and Crossref, which is a non-profit organization that provides a digital infrastructure for scholarly contents.
Some other sources are ORCID, ROR, DOAJ, Unpaywall, PubMed, PubMed Central, The ISSN International Centre, Internet Archive and more.

You can find 8 Types of data in OpenAlex:

• Works - journal articles, books, book chapters, datasets, conference proceedings, preprints, and theses/dissertations
• Authors - people that create works
• Sources - such as journals, conferences, and repositories
• Institutions - Universities and other organizations to which authors claim affiliations
• Concepts - Topics assigned to works
• Publishers: Companies and organizations that distribute works
• Funders: Organizations that fund research
• Geo: Locations in the world

source: https://libguides.eduhk.hk/openalex