Amazon Route 53 - Amazon Route 53 is a highly available and scalable DNS web service.
Brandpa - Domain names for startups
Cloudflare DNS - Install the free app that makes your phone’s Internet more fast, private, and reliable.
DomainWatch - Domain Monitoring Made Easy
Infoblox DDI - Infoblox’s industry leading integrated, centrally managed approach to delivering enterprise-grade DNS, DHCP, and IP address management (DDI) supports current and evolving IT needs.
Nuage - Nuage provides domain naming services.