Clearbit - Clearbit provides Business Intelligence APIs
Evercontact - Your contacts always up to date and automatically with Evercontact.
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
CONTACTBOX - CONTACTBOX combines the simplicity of an address book with effective functions of a CRM system.
InsideView - InsideView aggregates and curates all the company and contact data, news and social insights, and professional connections you need to do business better.
Bigin by Zoho CRM - Pipeline-centric CRM built and priced for small businesses