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Cardhop - The Mac contacts app you'll want to use.
Clearbit - Clearbit provides Business Intelligence APIs
Google Contacts - Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
Contalist - The contact app for professionals and small businesses
InsideView - InsideView aggregates and curates all the company and contact data, news and social insights, and professional connections you need to do business better.