Google Chrome Developer Tools - Get started with Google Chrome's built-in web developer tools.
Qualys - Qualys helps your business automate the full spectrum of auditing, compliance and protection of your IT systems and web applications.
Code Cola - Code Cola is a chrome extension to editor online pages' style visibility.
Nessus - Nessus Professional is a security platform designed for businesses who want to protect the security of themselves, their clients, and their customers.
Fiddler - Fiddler is a debugging program for websites.
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.