pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
Palo Alto Networks WildFire - Firewall and Threat Intelligence
F5 Advanced Firewall Manager - Stop even the most massive and complex DDoS attacks with BIG-IP Advanced Firewall Manager: advanced data center protection against layer 3–4 threats.
Zscaler Web Security - Zscaler offers cloud-based web security solutions.
FireMon - FireMon Security Intelligence Platform delivers continuous visibility into and control over firewall infrastructure.
Meraki MX Firewalls - Cloud managed networking from Cisco Meraki. The easiest and most IT-friendly solution for enterprise networking needs.