DomainWheel - Smart startup name generator
Ethereum Name Service - Like DNS, but for Ethereum wallet addresses
Domainz.io - Premium domains, for not so premium prices
How DNS Works - Super cute web comics about 'How DNS Works' for beginners!
Selldom - Make money from your unused domains 💸
SolveDNS - SolveDNS works to check your name servers, a records, and mail servers, SOA records for errors, consistency, efficiency and speed using several DNS tests.