HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.
UTest - uTest is the world's largest professional network for software testers and test engineers - 175,000+ QA professionals from more than 200 countries and territories.
Intruder - Intruder is a security monitoring platform for internet-facing systems.
test IO - QA platform to test web & mobile apps
Nessus - Nessus Professional is a security platform designed for businesses who want to protect the security of themselves, their clients, and their customers.
PingPong UX - The easiest way to run remote user research. Test your product with users worldwide & create experiences they'll love.