Acunetix - Audit your website security and web applications for SQL injection, Cross site scripting and other...
Nessus - Nessus Professional is a security platform designed for businesses who want to protect the security of themselves, their clients, and their customers.
Shodan - Shodan is the world's first search engine for Internet-connected devices.
AlienVault USM (from AT&T Cybersecurity) - AlienVault USM Anywhere delivers powerful threat detection, incident response, and compliance management for cloud, on-premises, and hybrid environments.
Intruder - Intruder is a security monitoring platform for internet-facing systems.
Tenable.io - Tenable.io Cyber Exposure platform helps to protect any asset on any computing platform and eliminate blind spots.