"RefSeek is a web search engine for students and researchers that aims to make academic information easily accessible to everyone. RefSeek searches more than five billion documents, including web pages, books, encyclopedias, journals, and newspapers."
"Intelligence X is a search engine and data archive.
Intelligence X is an independent European technology company founded in 2018 by Peter Kleissner. The company is based in Prague, Czech Republic. Its mission is to develop and maintain the search engine and data archive."
"Anna's Archive is a project that aims to catalog all the books in existence, by aggregating data from various sources. We also track humanity's progress toward making all these books easily available in digital form, through "shadow libraries". Learn more about us."
"Riddler.io allows you to search in a high quality dataset with more than 400,326,949 hostnames. Unlike others, we do not rely on simple port scanning techniques - we crawl the web, ensuring an in-depth quality data set you will not find anywhere else."
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