CloudFlare is a content delivery network and distributed domain name server service that improves website performance and speed and provides security.
Akamai is a cloud platform for media and content delivery, application performance, and Web security.
MaxCDN is a content delivery network dedicated to reducing latency of rich-content delivery.
jsDelivr is a free, open source CDN for webmasters and developers.
SCD is their version of CDN which is 'Secure Content Delivery.' Comes with WAF and DDoS protection.
Incapsula is a cloud based security platform that delivers applications. Features provided by Incapsula include DDoS protection, failover services and load balancing.