AB for Web
(commercial) AB for Web publishes - by means of a fast embedded web server - address books through your LAN or internet. Thus any Mac OS X, Mac OS 9, Windows or Linux user is able to use your central entertprise address book.
(commercial) AB Transfer is an address book tool. AB Transfer is a versatile utility to import and export contact data.
AdiumBook is a Mac OS X bridge application between Adium and Address Book to keep your contacts in sync. You can add contacts, update people's info using Adium data, perform full text search for both applications, and produce useful reports listing missing or incomplete contacts.
Age is an Apple's Address Book plug-in that calculate the age of a person using the birthday date.
ContactCreator.service is an address book service for adding contacts.
MemoDate reads the Address Book database (without launching ir) to display upcoming birthday in a list, ability to click to directly send an email.
people book is a full-featured address book with a very elegant, intuitive interface, made specifically for Mac OS X. It was designed to work the way you expect it to and to make managing and using your contacts as quick and easy as possible.
Plaxo for Mac synchronizes your Mac OS X Address Book with your Plaxo Universal Address Book.
The Plaxo Toolbar for Mac synchronizes your Mac OS X Address Book with your Plaxo Universal Address Book. Wherever you install a Plaxo toolbar, your address book will be consistent and stay up-to-date automatically.
Relationship Completer is an Address Book plugin adds a new menu item for ?Related Names? that allows you to automatically complete the relationship by creating the complementary related name entry.
Ripplex Address Book
Ripplex Address Book sync address book on multiple Macs and PCs.
(commercial) shares and synchronizes the OS X address book. The applications ships as a fat binary, which includes localizations for these languages: English, German