Official Tor service distributing bridge relay addresses to users facing network blocking.
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Tor network-health dashboard showing directory consensus, votes, signatures and relay measurements.
Historical lookup showing whether an IP address appeared as a Tor relay on a specified date.
Terminal monitor for inspecting a local Tor process, circuits, connections and relay activity.
Historical public mailing-list messages documenting Tor development, research and relay operations.
Official community forum for Tor users, relay operators, developers and onion-service administrators.
Protocol and API documentation for Tor relay and bridge status data used by network tools.
Tor measurement project collecting performance data for public relays, bridges and onion services.
Independent dashboard analyzing Tor relay operators, concentration and network diversity.
Official interface for exploring public Tor relay and bridge metadata from Onionoo.
Active public discussion archive for Tor relay and bridge operators, support questions and network issues.
Question-and-answer archive covering Tor configuration, relays, onion services and research.
Explains how metadata and structured access affect discovery of database-backed and deep-web content.
National Academies chapter explaining deep-web content, discovery limits and information retrieval.
National Transportation Library record for research on discovering and cataloging hidden-web resources.
Guide to search tools and databases that surface information outside conventional web indexes.
ERIC record for a guide to finding specialized databases and other web content missed by search engines.
Open-source research crawler for collecting links and metadata from reachable onion pages.
Tor add-on that helps onion-service operators reduce guard-discovery and related attacks.
Federated search portal querying science databases and repositories across many countries.