Evercontact - Your contacts always up to date and automatically with Evercontact.

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.

CONTACTBOX - CONTACTBOX combines the simplicity of an address book with effective functions of a CRM system.

Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.

Bigin by Zoho CRM - Pipeline-centric CRM built and priced for small businesses

Apple Contacts App - Access and edit your contacts from personal, business, and other accounts with the Contacts app.