When a blog post from 2013 is the first featured as "Popular content" on a UK academic website it must have something going for it. That's the case for Ten search engines for researchers that go beyond Google on the Jisc* website.
Some, like WolframAlpha, you've likely heard of before. Others are only available to the UK academic community. A new one to me, openly available and claiming access to more than 90 million documents, was BASE, described as
" one of the world's most voluminous search engines especially for academic open access web resources from over 2,000 sources.I tried it and found documents of interest for my genealogy research that Google missed. Try locations in your family history as well as names.
Key features: Allows you to search intellectually selected resources and their bibliographic data, including those from the so-called ‘deep web’, which are ignored by commercial search engines."
*Jisc is the former Joint Information Systems Committee, "a United Kingdom non-departmental public body whose role is to support post-16 and higher education, and research, by providing relevant and useful advice, digital resources and network and technology services, while researching and developing new technologies and ways of working."