HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.
Instabug - The top apps in the world rely on Instabug for beta testing, user engagement and crash reporting.
Acunetix - Audit your website security and web applications for SQL injection, Cross site scripting and other...
UserTest.io - User testing made simple. High-quality, affordable user testing solutions from real users, here in the UK. Improve your usability!
Forcepoint Web Security Suite - Internet Security
Userbrain - Easy, fast, and affordable user testing for websites and prototypes.