ContactShareApp.com - ShareEmailContacts.com lets you easily share contact lists or groups with other users within and external users using Gmail or G-Suite Contacts. Free Signup
Evercontact - Your contacts always up to date and automatically with Evercontact.
Amicu - Improve social habits by using reminders to keep in touch.
CONTACTBOX - CONTACTBOX combines the simplicity of an address book with effective functions of a CRM system.
Shared Contacts For GMail - Share contacts and address books with your team in Google Workspace, previously known as G Suite, Gmail, or your mobile Contact app, just like you share Google docs!
CRM-gx - Contact Management