Duplicate Contacts Fixer and Remover Alternatives

Next generation contact manager and dialer.

Automagically scan biz cards into LinkedIn/Gmail contacts

A full-fledged CRM for high-velocity sales teams.

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All your contacts in one place

Find a person by a name or phone number worldwide for free using Truecaller.

The Nextcloud contacts app is a user interface for Nextcloud's CardDAV server.

Open Source

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.

Phone + Contacts and Calls app offers features that let you backup and synchronize your phone book so you can view it on all your other smart devices as well as can also restore it for later use.

Kontact is the integrated Personal Information Manager of KDE.

Messages is an app by Gather Media that allows users to get notification alerts about new messages on the basis of priority level.

A platform that makes connecting third-party APIs easy

KAddressBook stores all the personal details of your family, friends and other contacts.

Contact lens prescriptions from home

Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!