AWS WAF - AWS WAF is a web application firewall that helps protect your web applications from common web exploits.
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
ModSecurity - ModSecurity is an Open Source web application firewall developed by Trustwave's SpiderLabs.
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.
Imperva Cloud Application Security - Deploy your applications and data where you want. When you want. Imperva keeps them secure in the cloud, on premises, and in hybrid clouds.
FireMon - FireMon Security Intelligence Platform delivers continuous visibility into and control over firewall infrastructure.