Corptabs - Corptabs is a secure and reliable cloud-based communication software that allows organizations to connect businesses and employees with dynamic broadcast messaging.
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
CallzApp - CallzApp, world’s only dialer app that can prioritize communications
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
Briar - Secure messaging, anywhere
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.