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Official guides for understanding, deploying and maintaining Tor onion services.

Tor Project documentation portal for onion-service applications, standards and operator tools.

Load-balancing system for resilient Tor onion services, documented by the Tor onion-services team.

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.

Python package that queries several search engines to find indexed Tor onion pages.

Independent dashboard analyzing Tor relay operators, concentration and network diversity.

Python controller library for applications that monitor or manage Tor processes.

Twisted-based Python library for controlling Tor and building onion-service applications.

Tor add-on that helps onion-service operators reduce guard-discovery and related attacks.

Open-source interface and API project for searching indexed onion content.

Research paper describing large-scale crawling and analysis methods for onion services.

Historical visualization and research record mapping a sample of linked Tor onion services.

Research paper evaluating abuse observed through a controlled honeypot hosted as a Tor onion service.

Open-source utility for gathering public metadata about onion services during authorized research.

Open-source scanner for auditing onion-service metadata and operational security.

Open-source command-line tool that queries multiple onion search engines and exports results.

Research article cataloging ransomware leak sites and explaining how their status is tracked.

Open-source whistleblowing system that lets sources submit documents to newsrooms over Tor.

Official source guide for using verified SecureDrop instances and protecting submission codes.

Open-source research crawler for collecting links and metadata from reachable onion pages.