SmartContract.com - ChainLink - Connect Smart Contracts to your Applications and Data
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
Fondu - Open source free ICO smart-contract builder
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.
PAID Network - PAID network's SMART agreements will transform business
Nextcloud Contacts - The Nextcloud contacts app is a user interface for Nextcloud's CardDAV server.