Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
ExDialer - ExDialer- Dialer and Contacts developed and published by Modoohut for Android and iOS devices.
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.
WhosCall - WhosCall is a reliable caller ID app whose popularity has led to its adoption by many users including international media. You can now manage the numbers calling you regardless of whether they are part of your contact list or not... read more.
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
TrapCall - TrapCall is an application for the purpose of getting the caller IDs and unmasking the blocked calls.