What are some alternatives?
BrandHunt V2 - Search/track domain & social media handles in real time.
Namefruits - Find the perfect name for your startup
Lean Domain Search - Find a Great Domain Name w/ twitter handle availability
Naminum - A company name generator that's actually useful
Undeveloped - Domains you never thought were available
NameMesh - Get smart domain name suggestions using synonyms, suffixes, prefixes, short url, new gtlds to find the perfect domain name. Generate ideas for social user names and check availability for free!