fruux - Free service that takes care of your contacts, calendars and more so you don't have to.

dstillery - Dstillery is an advertising technology provider enabling marketers to target prospects through scientific methods.

FullContact - Put the power of full contact information into your web or mobile apps.

DTScout - DTScout provides global behavioural and demographic audience data.

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.

Datafinder - Datafinder offers self-serve predictive marketing suite offering clients with relevant consumer data.