Cardhop - The Mac contacts app you'll want to use.
ContactRescue - Magically get your address book up-to-date and accurate
The Contact Guru - Managing your contact list so you don't have to
Pulse Uno - Let them know about you.
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.
Wall Of Me - Wall of me: all your favorite socials in a single place.