ahmia.fi
Search engine for finding indexed Tor onion services, with abuse filtering and public documentation.
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Published directory entries matching your search.
arxiv.org
Research paper on integrating data from web databases that are not directly indexed by search engines.
pypi.org
Python package that queries several search engines to find indexed Tor onion pages.
github.com
Open-source command-line tool that queries multiple onion search engines and exports results.
onlinelibrary.london.ac.uk
University guide to finding databases and information that ordinary search engines do not index.
eric.ed.gov
ERIC record for a guide to finding specialized databases and other web content missed by search engines.