ModSecurity - ModSecurity is an Open Source web application firewall developed by Trustwave's SpiderLabs.
CloudFlare - Cloudflare is a global network designed to make everything you connect to the Internet secure, private, fast, and reliable.
Shadow Daemon - Shadow Daemon is a collection of tools to detect, record and prevent attacks on web applications.
Amazon CloudFront - Amazon CloudFront is a content delivery web service.
ironbee - Universal web application firewall engine
KeyCDN - KeyCDN is a high-performance Content Delivery Network (CDN). Lowest price globally at $0.04/GB with HTTP/2 Support and free Origin Shield.