Clearbit - Clearbit provides Business Intelligence APIs
StatCounter - StatCounter is a simple but powerful real-time web analytics service that helps you track, analyse and understand your visitors so you can make good decisions to become more successful online.
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
Woopra - Track your customers' web and mobile activity, forms, emails, support tickets and more, all in one place with customer analytics. Analyze and take action.
InsideView - InsideView aggregates and curates all the company and contact data, news and social insights, and professional connections you need to do business better.
Histats - Start tracking your visitors in 1 minute!