CloudFlare - Cloudflare is a global network designed to make everything you connect to the Internet secure, private, fast, and reliable.
TinyWall - Lightweight and non-intrusive firewall
SiteLock - SiteLock software provides advanced website security, daily security scans, web app firewall with a CDN to deliver content more securely.
SonicWall - SonicWall security solutions protects your network, systems, users and data from cyber threats.
Amazon CloudFront - Amazon CloudFront is a content delivery web service.
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more