InsideView - InsideView aggregates and curates all the company and contact data, news and social insights, and professional connections you need to do business better.
Clearbit - Clearbit provides Business Intelligence APIs
Datanyze - The sales prospecting tool powered by technology data
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
Nimble - Nimble is the only solution to offer small businesses the best features of high-end CRM systems combined with the power of social media.
Yesware - Sell smarter with email tracking and more