CloudFlare - Cloudflare is a global network designed to make everything you connect to the Internet secure, private, fast, and reliable.
Myra Security - The Myra Security-as-a-Service platform monitors, analyzes, and filters malicious internet traffic before virtual attacks can do any real harm.
DDoS-GUARD - DDoS protection for websites and networks. CDN included.
Amazon CloudFront - Amazon CloudFront is a content delivery web service.
Sucuri - Website Protection, Malware Removal, and Blacklist Prevention
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.