Salesforce Data.com - Data.com provides company profiles and contact information across millions of businesses worldwide.
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.
HookFeed - Customer Analytics in One Click.
Numlooker - Numlooker is a web-based tool that is used to reverse the phone number that you have received.
LeadGibbon - Access millions of business contacts, with verified email addresses and phone numbers
CocoFinder - CocoFinder is the search engine that is used to search the people and get complete public information about the people.