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 * [GitGuardian - Public GitHub Monitoring](https://www.gitguardian.com/monitor-public-github-for-secrets) - Monitor public GitHub repositories in real time. Detect secrets and sensitive information to prevent hackers from using GitHub as a backdoor to your business.
 * [OnionScan](https://github.com/s-rah/onionscan) - Free and open source tool for investigating the Dark Web. Its main goal is to help researchers and investigators monitor and track Dark Web sites.
+* [onion-lookup](https://onion.ail-project.org/) - Free online service and API for checking the existence of Tor hidden services (.onion address) and retrieving their associated metadata. onion-lookup relies on an private AIL instance to obtain the metadata.
 * [OTX AlienVault](https://otx.alienvault.com/) - Open Threat Exchange is the neighborhood watch of the global intelligence community. It enables private companies, independent security researchers, and government agencies to openly collaborate and share the latest information about emerging threats, attack methods, and malicious actors, promoting greater security across the entire community.
 * [REScure Threat Intel Feed](https://rescure.fruxlabs.com/) - REScure is an independent threat intelligence project which we undertook to enhance our understanding of distributed systems, their integration, the nature of threat intelligence and how to efficiently collect, store, consume, distribute it.