arxiv.org
Research paper presenting a crawler architecture for collecting dark-web data over Tor.
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getty.edu
Explains how metadata and structured access affect discovery of database-backed and deep-web content.
academicworks.cuny.edu
CUNY research paper examining automated collection and analysis of dark-web forum data.
oedb.org
Guide to search tools and databases that surface information outside conventional web indexes.
onionservices.torproject.org
Tor Project documentation portal for onion-service applications, standards and operator tools.
metrics.torproject.org
Protocol and API documentation for Tor relay and bridge status data used by network tools.
github.com
Open-source command-line tool that queries multiple onion search engines and exports results.