Cardhop - The Mac contacts app you'll want to use.
DeepLink Kit - Add deep links to your app in 5 minutes.
ContactRescue - Magically get your address book up-to-date and accurate
DeepLink - Deeplink is a deep linking platform for native apps, enabling app developers to link to specific pages inside their apps.
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.
Keep In touch - Keep in touch with thousands of people