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.

True Contact - True Contact is a special caller ID revealing app for those smartphone users who want to resolve their issue of unknown and unwanted calls.

Google Calendar - Spend less time managing your day & more time enjoying it

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

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

Drupe - Next generation contact manager and dialer.