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.
Simple Contacts - Contact lens prescriptions from home
Contact PEA - Encrypted contact management tool.
Open Contacts - Open Contacts is an advanced address book program for managing contact info of individuals and...
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
Kontact - Kontact is the integrated Personal Information Manager of KDE.