FullContact - Put the power of full contact information into your web or mobile apps.
fruux - Free service that takes care of your contacts, calendars and more so you don't have to.
Pipl - The most comprehensive people search. Pipl is the place to find the person behind the email address, social username or phone number.
Evercontact - Your contacts always up to date and automatically with Evercontact.
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.
CamCard - CamCard reads business cards and save instantly to phone Contacts.