FlashStart - The FlashStart Cloud is a web filter for malware protections and to manage unwanted and offensive internet content.
Amazon Route 53 - Amazon Route 53 is a highly available and scalable DNS web service.
OpenDNS Umbrella - Cloud Security
DNSimple - Domain Name Service with low cost hosted DNS, an easy to use web interface, and a REST API for automation. Hosting DNS has never been so simple.
SPS Threat Avert - Is your network protected from DNS Tunneling and DDoS attacks, including PRSD and amplification?
GoDaddy DNS - GoDaddy DNS helps manage website performance, reliability and security.