What are the best Bug Bounty as a Service Tools?

HackerOne, Bugcrowd, Cobalt, Federacy, and CrowdCurity are the most popular tools in the category "Bug Bounty as a Service". "Security Response" is the primary reason developers pick HackerOne over its competitors, while "Third party oversight so incs can't rip off researchers" is the reason why Bugcrowd was chosen.