Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
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!
PublicWWW - source code search engine
NameQL - Fast and friendly way to find a usable name for your idea, app or business
BuiltWith - Find out the technology behind websites
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.