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.
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Magic Spreadsheet - Human workforce and AI plugged into your Google Spreadsheets
Apple Contacts App - Access and edit your contacts from personal, business, and other accounts with the Contacts app.
Sheetsu - Turn Google Spreadsheet into API