Searching the Dark/Deep web is a great intelligence activity that can yield a multitude of different treasures. This is a great resource for spotting early indicators of a breach or getting the latest trends in cyber crime.
*Darknet and .onion sites change frequently. This list may not be up to date.
Clearnet Search Engines
Ahmia - Ahmia searches hidden services on the Tor network. To access these hidden services, you need the Tor browser bundle.
Dark Search - A clearnet search engine for searching the Dark Web
https://www.dargle.net/search - A data aggregation platform for dark web domains. Using this directory, we can generate a portfolio of domains and their statuses, gain insight into the content and nature of these services, as well as the connections between them.
Haystack - Search engine service to discover hidden services and gain access to onion sites or eepsites in the I2P network.
https://www.darkowl.com/darknetdataproducts - A great tool for searching through different darknets including TOR, I2P, ZeroNet and paste sites. Requires a paid subscription.
https://iaca-darkweb-tools.com - A collection of darkweb search tools. Allows you to query .onion search engines, marketplaces and social media sites.
Onion Search - OnionSearch is a Python3 script that scrapes urls on different ".onion" search engines.
TorBot - Open source Intel tool for searching and crawling the Dark Web.
https://torwhois.com - Look up an .onion address and see basic information such as date last seen, open ports, running software and banners. You can also query specific onions from the command line: whois -h torwhois.com facebookcorewwwi.onion
https://osint.party/api/rss/fresh - An amazing RSS feed of fresh and newly discovered .onion sites. Be careful, this feed remains uncensored, so you may encounter illegal content.
https://darktracer.com/ - Darkweb intelligence too. Has a free version for a limited number of queries.