Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Dialer One - CyburDial: Revolutionizing Connections, Empowering Conversations with and Artificial Intelligence driven Dialer.
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.
Google - Google Search, also referred to as Google Web Search or simply Google, is a web search engine developed by Google. It is the most used search engine on the World Wide Web
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
Rolo - The contact manager that you will actually use every day.