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
YesWeHack - Global Bug Bounty & Vulnerability Management Platform
HackenProof - The world trusted Bug Bounty Platform for crypto projects
Intigriti - Intigriti offers bug bounty and agile penetration testing solutions powered by Europe's #1 leading network of ethical hackers.
Open Bug Bounty - OpenBugBounty is a vulnerability disclosure platform helping businesses to identify and fix security vulnerabilities.