FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Zapier - Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.
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.
n8n.io - Free and open fair-code licensed node based Workflow Automation Tool. Easily automate tasks across different services.