FastPeopleSearch - Research people reverse lookup various pieces of information similar.
fruux - Free service that takes care of your contacts, calendars and more so you don't have to.
Intelius - Intelius is a standout amongst the most surely understood online pursuits to use in discovering everything there is to think about a man.
FullContact - Put the power of full contact information into your web or mobile apps.
InfoMart - InfoMart is an Atlanta based background screening company specializing in pre-employment background checks and occupational health screening.
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.