Cardhop - The Mac contacts app you'll want to use.
PING - PING (Partimage Is Not Ghost) is a free software Linux-based live CD ISO built upon the partimage...
The Contact Guru - Managing your contact list so you don't have to
BizOps Network - The BizOps Network is the preeminent community and learning platform for business operations leaders.
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.
Cardify - The fastest business card experience ever