One Word Domains - Database of all available one-word domains
Domainr - Domainr
Handshake.org - Decentralized certificate authority and naming
Instant Domain Search - Search domain names instantly by showing results as you type.
Lean Domain Search - Find a Great Domain Name w/ twitter handle availability
GoDaddy - GoDaddy makes registering Domain Names fast, simple, and affordable. Find out why so many business owners chose GoDaddy to be their Domain Name Registrar.