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.
ExDialer - ExDialer- Dialer and Contacts developed and published by Modoohut for Android and iOS devices.
Drupe - Next generation contact manager and dialer.
Bluff My Call - Bluff My Call app provides features to allow users to make prank calls to their friends and family members by changing their voice and caller ID in a few simple steps.
Simple Contacts - Contact lens prescriptions from home