Domainr - Domainr is the only ICANN-accredited domain status API provider.
Name Ideas Generator - A simplistic domain name generator.
Lean Domain Search - Find a Great Domain Name w/ twitter handle availability
NameQL - Fast and friendly way to find a usable name for your idea, app or business
Instant Domain Search - Search domain names instantly by showing results as you type.
DomainWheel - Smart startup name generator