Kontact

Kontact is the integrated Personal Information Manager of KDE.

20 Alternatives To Kontact

Alpine

Alpine is a fast, easy to use email client that is suitable for both the inexperienced email user…
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Apple Contacts App

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

There’s big news attached.

CalenGoo

Features | 1.0.175 for Android™

CircleBack

Contact sync application.

Etar

Material design open source calendar for Android.
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Evolution

Apps/Evolution - GNOME Wiki!
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FullContact

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

GNOME Calendar is a simple and beautiful calendar application designed to perfectly fit the GNOME…
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Google Calendar

Spend less time managing your day & more time enjoying it
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Kontact - KAddressBook

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

Lightning Calendar

Organize your life — it’s about time!

Memotoo

Memotoo allows you to sync your data (contacts, calendar, tasks, .) with phones (iPhone, Android, Samsung, ..

Mutt

Add forums and commenting to your site. Unlimited posts, users and traffic, for free. Embeddable, styleable and scriptable.
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Outlook

Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.

Rainlendar

Rainlendar - Customizable desktop calendar

Simple Calendar

A simple calendar with events (optional recurring and reminders), week numbers and a customizable…

VueMinder Calendar

Take control of your schedule and get reminded wherever and however you want.
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eM Client

eM Client is a Windows-based email client for sending and receiving emails, and managing calendars, contacts and tasks.

fruux

Free service that takes care of your contacts, calendars and more so you don’t have to.