Voyager Data Dragon supports crawling Tor Hidden Services out of the box. You can setup dedicated Tor crawlers or catch Tor links (.onion) directly when the crawler encounters them on the Clear Web - thereby creating interesting relations between the Clear Web and Darknet. Other Darknet networks, techniques and protocols (like Freenet and I2P) can be supported by custom plugins and proxies.
Web-IQ actively crawls Tor Hidden services, forums and Black Markets since 2015. This growing dataset with millions of documents is available to our partners.