Cisdem ContactsMate (was Contact Manager) is a great contacts manager. It allows you to backup everything in Contacts; edit the Contacts fields; find, analyze, report, and fix dozens of problems with OS X Contacts; and export your address book to CSV, vCard, TXT, DocX, HTML, Excel, Numbers, and Pages formats for easy Contacts backup or sync.
Features
– Import Contacts
– Easily view, add, edit, group, tag, and manage contacts
– Delete duplicate contacts, fix formatting errors
– Share, export and back up contacts to quickly exchange information
Compatibility: OS X 10.11 or later 64-bit