Brandpa - Domain names for startups
Lean Domain Search - Find a Great Domain Name w/ twitter handle availability
Panabee - Best way to search domain names, esp for apps and startups
SafeSocial - Make the Internet a better place
Mashword - Find a name and register a domain for your business, baby, project, and more. Mashword is a powerful company and human name generator that determines the pronunciations of entered words and then creates unique combinations and variations.
Domainr - Domainr is the only ICANN-accredited domain status API provider.