pypi.org
OSINT tool for gathering emails, domains, hosts, and public data from search engines and sources.
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cymon.io
Threat intelligence search service for checking IPs, domains, hashes, and security indicators.
transparencyreport.google.com
Google certificate transparency search for checking certificates and HTTPS records.
classics.mit.edu
The Internet Classics Archive provides 441 works of classical literature by 59 different authors, mainly Greco-Roman works with some Chinese and Persian, all in English translation. It has operated since 1994 and is run by Daniel C. Stevenson, Web Atomics. A copy was taken over by MIT IS&T after the classics.mit.edu site stopped responding. The site states that all works are, to its knowledge, in the public domain.