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.
BusyContacts - BusyContacts is a contact manager for macOS.
Open Contacts - Open Contacts is an advanced address book program for managing contact info of individuals and...
Windows Contacts - Windows has many extraordinary organizers, and in the event that you include distributed storage, then you presumably have more.
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
Monica - Monica is an open-source personal CRM to keep track of your friends and family.