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.

Open Contacts is an advanced address book program for managing contact info of individuals and...

Access and edit your contacts from personal, business, and other accounts with the Contacts app.

Automagically scan biz cards into LinkedIn/Gmail contacts

Kontact is the integrated Personal Information Manager of KDE.

Put the power of full contact information into your web or mobile apps.

In our contact management software you can store fast and easily name, phone numbers, birthdays, address, company name, city, mobile numbers, insurance and loan info, e-mail addresses.

Windows has many extraordinary organizers, and in the event that you include distributed storage, then you presumably have more.

Contact lens prescriptions from home

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

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

Open Source

E-Z Contact Book is an easy to use yet powerful Windows application for managing contact information. You can use it as a personal contact address/phone book, business directory, or a customer database, or a reminder of birthdays and other events

BusyContacts is a contact manager for macOS.