Dux Soup - Dux-Soup is a lead generation tool for LinkedIn.
Clearbit - Clearbit provides Business Intelligence APIs
CloudSponge - Companies from every industry use CloudSponge’s Contact Picker to get access to their users’ address books.
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
BuzzBuilder - BuzzBuilder is a web-based lead generation tool that manages targeted email marketing campaigns and generates B2B sales leads.
InsideView - InsideView aggregates and curates all the company and contact data, news and social insights, and professional connections you need to do business better.