Top Alternatives to Kontact

Google Calendar is a cloud based calendar from Google.

Microsoft Outlook is a personal information manager from Microsoft.

Apple Mail is an email client included with the operating systems macOS, iOS and watchOS by Apple Inc.

eM Client is a Windows based e-mail client for sending and receiving e-mails, managing calendars, contacts, and tasks.

Postbox is powerful, intuitive, ultra-customizable, speedy task manager.

Calendar is a personal calendar application made by Apple Inc. that runs on both the macOS desktop operating system and iOS mobile operating system.

Rainlendar is a calendar program for Windows, Mac OS X and Linux.

MyLifeOrganized (MLO) is the most flexible and powerful task management software for getting your to-dos finally done.

EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries, etc.

The Bat! is an email program for Windows that protects the correspondence and empowers the users to handle large amounts of emails quickly and efficiently.

Airmail is a fast mail client for Mac and iPhone.

Sylpheed is an open-source e-mail client and news client licensed under the GPL.

Mutt is a text-based email client for Unix-like systems.

Fantastical is the calendar app for Mac.

Zimbra Desktop is an offline client that lets you manage various email accounts in one desktop tool.

UV Outliner is a single pane outliner with multicolumn support.

FullContact gives you all the power of your address book, right in your Gmail inbox.

OpenProject is a web-based project management system for location-independent team collaboration.

Google Contacts is Googles contact management tool that is available in its free email service Gmail.

Memotoo sync all your contacts from Gmail, Facebook, phone, Thunderbird, Outlook, etc in a single address book.

Contacts is a default contacts management app for Mac based operating systems.

AOL Mail (Aol Mail) is a free web-based email service.

Polymail is an email application for OS X and iOS known for its clean interface and additional features atop the Gmail platform.

Microsoft Mail and Calendar apps help you stay up to date on your email, manage your schedule and stay in touch with people you care about the most.

MailMate is an IMAP email client for macOS featuring extensive keyboard control, Markdown integrated email composition, advanced search conditions.

KOrganizer is the calendar and scheduling component of Kontact, the integrated personal information manager from KDE.

FCorp ID Book is a portable, light but powerful address book.