Cardhop - The Mac contacts app you'll want to use.
Open Contacts - Open Contacts is an advanced address book program for managing contact info of individuals and...
The Contact Guru - Managing your contact list so you don't have to
Free Address Book - In our contact management software you can store fast and easily name, phone numbers, birthdays, address, company name, city, mobile numbers, insurance and loan info, e-mail addresses.
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.
ContactRescue - Magically get your address book up-to-date and accurate