free access to scientific articles - SERP Analysis

https://www.scienceopen.com/

https://www.reddit.com/r/coolguides/comments/xr7dr0/how_to_get_scientific_papers_for_free/

https://about.jstor.org/oa-and-free/

https://unpaywall.org/

https://library.harvard.edu/how-to/get-scholarly-articles-free

https://scholar.google.com/

https://libguides.northwestern.edu/freescholarlyresources

https://www.scribendi.com/academy/articles/free_online_journal_and_research_databases.en.html

https://doaj.org/

https://www.quora.com/Are-there-any-academic-websites-that-offer-free-access-to-journal-articles-in-various-fields-of-study-including-science-engineering-and-history