Little Snitch - Little Snitch is a firewall application that monitors and controls outbound internet traffic.

Tenable.io - Tenable.io Cyber Exposure platform helps to protect any asset on any computing platform and eliminate blind spots.

Gufw - Gufw is an easy, intuitive way to manage your Linux firewall.

BreachLock - BreachLock is a versatile platform that provides scalable and smooth penetration testing services for vulnerabilities.

netfilter - Netfilter software comprises iptables, ipset, conntrack-tools, libnetfilter and more.

Qualys - Qualys helps your business automate the full spectrum of auditing, compliance and protection of your IT systems and web applications.