pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more

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

Palo Alto Networks WildFire - Firewall and Threat Intelligence

Nessus - Nessus Professional is a security platform designed for businesses who want to protect the security of themselves, their clients, and their customers.

IPFire - IPFire is a server distribution with intended to use as a firewall.

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