HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.
Federacy - Bug bounty and security testing platform.
Intruder - Intruder is a security monitoring platform for internet-facing systems.
Bounties Network - Complete tasks, earn crypto
Nessus - Nessus Professional is a security platform designed for businesses who want to protect the security of themselves, their clients, and their customers.
WhiteHub - A crowdsourced security platform