FullContact - Put the power of full contact information into your web or mobile apps.
ZabaSearch - Find people free with Zabasearch directory engine that includes free people search, reverse phone number lookup, address lookup, and more.
Pipl - The most comprehensive people search. Pipl is the place to find the person behind the email address, social username or phone number.
RealPeopleSearch - RealPeopleSearch is a web-based software that allows you to get the basic and public record of the concerned person within a few minutes by providing little information.
Evercontact - Your contacts always up to date and automatically with Evercontact.
Numlooker - Numlooker is a web-based tool that is used to reverse the phone number that you have received.