HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.
Bugcrowd - Harness the largest pool of curated and ranked security researchers to run the most efficient bug bounty and penetration tests
SafeHats - Safehats is providing bug bounty and vulnerability disclosure services to enterprises.
HackenProof - The world trusted Bug Bounty Platform for crypto projects
YesWeHack - Global Bug Bounty & Vulnerability Management Platform
Axonius - Cyber security asset management to see and secure all