Whoisology - Connected database of whois records and whois history
NameMing - 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!
Bulk Whois API - Bulk Whois API is a provider of parsed WHOIS data in JSON with simple API, competitive pricing, top notch support, and more.
NameQL - Fast and friendly way to find a usable name for your idea, app or business
WhoisAPI - WhoisAPI is the premier provider of freshly parsed whois data for domain names and IP addresses...
NameBounce - NameBounce is a powerful domain name and business name generator. Using our advanced search algorithms, you can routinely uncover domain names that would be worth $2,000 or more on a resale site.