Evercontact - Your contacts always up to date and automatically with Evercontact.
BusyContacts - BusyContacts is a contact manager for macOS.
CONTACTBOX - CONTACTBOX combines the simplicity of an address book with effective functions of a CRM system.
Apple Contacts App - Access and edit your contacts from personal, business, and other accounts with the Contacts app.
CRM-gx - Contact Management
Windows Contacts - Windows has many extraordinary organizers, and in the event that you include distributed storage, then you presumably have more.