Barracuda Web Application Firewall - Barracuda Web Application Firewall offers security and DDoS protection against automated & targeted attacks.
AWS WAF - AWS WAF is a web application firewall that helps protect your web applications from common web exploits.
Cloudbric - Cloudbric is a website security program that aims to block cyber attacks on your site. Security programs like Cloudbric are important for any large sites or any sites that handle money or secure information. Read more about Cloudbric.
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.
Incapsula - Incapsula is a Security CDN that makes any website safer, faster and more reliable. 5 minute setup will make a world of difference.
nginx - A high performance free open source web server powering busiest sites on the Internet.