Google Scholar is the one and only Google product I still use sometimes
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Semantic Scholar, maybe ResearchGate? Academia.edu ??
Make sure to look at their T&C and privacy policy.
In addition to the ones already named:
https://scholar.archive.org/
https://oapen.org
https://scholar.archive.org/
Strong and powerful header image
I use google maps for its bike paths but thats genuinely it I think
