Amazon Route 53 - Amazon Route 53 is a highly available and scalable DNS web service.
Dictionary Domains - Unregistered dictionary word domains for your side project
Cloudflare DNS - Install the free app that makes your phone’s Internet more fast, private, and reliable.
Domainz.io - Premium domains, for not so premium prices
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.
DomainWatch - Domain Monitoring Made Easy