Trust Wallet - Trust - Ethereum Wallet
Ethereum Name Service - Like DNS, but for Ethereum wallet addresses
Coinbase - Bitcoin, safe and easy.
How DNS Works - Super cute web comics about 'How DNS Works' for beginners!
MetaMask.io - A crypto wallet & gateway to blockchain apps
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.