HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.

UserTesting.com - Usability testing has never been easier. Get videos of real people speaking their thoughts as they use websites, mobile apps, prototypes and more!

Acunetix - Audit your website security and web applications for SQL injection, Cross site scripting and other...

Userbrain - Easy, fast, and affordable user testing for websites and prototypes.

Trustwave Services - Trustwave is a leading cybersecurity and managed security services provider that helps businesses fight cybercrime, protect data and reduce security risk.

userinput.io - Get on-demand feedback for your app, website or idea. Learn how to improve by hearing real opinions.