w3af - w3af is a Web Application Attack and Audit Framework
Tenable.io - Tenable.io Cyber Exposure platform helps to protect any asset on any computing platform and eliminate blind spots.
Shodan - Shodan is the world's first search engine for Internet-connected devices.
BreachLock - BreachLock is a versatile platform that provides scalable and smooth penetration testing services for vulnerabilities.
Grabber Web Application Scanner - Grabber is a web application scanner. It detects vulnerabilities in your website.
Qualys - Qualys helps your business automate the full spectrum of auditing, compliance and protection of your IT systems and web applications.