iDatabase for Mac - The intuitive personal database manager.
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
Philasmicos Contacts 2 - Philasmicos Contacts is a professional business relationships management system for macOS X.
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Steward Database - Steward is a personal database for organizing everything. It's easy to use.
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.