Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
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.
FCorp ID Book - ID Book is a handy, easy to use application specially designed to offer users a simple address book.
Apple Contacts App - Access and edit your contacts from personal, business, and other accounts with the Contacts app.
ThisNumber - ThisNumber helps you find phone numbers for people and businesses!
Free Address Book - In our contact management software you can store fast and easily name, phone numbers, birthdays, address, company name, city, mobile numbers, insurance and loan info, e-mail addresses.