ContactRescue - Magically get your address book up-to-date and accurate
Evercontact - Your contacts always up to date and automatically with Evercontact.
Cardhop - The Mac contacts app you'll want to use.
CONTACTBOX - CONTACTBOX combines the simplicity of an address book with effective functions of a CRM system.
Clearbit Connect - Clearbit Connect is a free extension that surfaces actionable information on the people who email you.
Pobuca Connect - Connect with your contacts.