Top 11 Open-Source Alternatives to Kontact

Product categories

Appointment Scheduling Appointments and Scheduling Calendar Calendar And Scheduling Call Management Contact Management Contacts Email Email Clients Email Management Email Service Provider Enterprise Communication

Summary

The top open-source alternatives to Kontact are Simple Calendar, Nextcloud Contacts, and Calendar Lock PEA. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

Simple Calendar Landing Page
1

Simple Calendar

A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Pricing:
- Open Source
#Calendar #Appointments and Scheduling #Email 99 social mentions
Nextcloud Contacts Landing Page
2

Nextcloud Contacts

The Nextcloud contacts app is a user interface for Nextcloud's CardDAV server.
Pricing:
- Open Source
#Contact Management #Contacts #Call Management
Calendar Lock PEA Landing Page
3

Calendar Lock PEA

Calendar Lock PEA is an encrypted desktop calendar with a day, week and month view. The shown calendars are never stored unencrypted on your disk, but exist only in the RAM. Platform-independent, Open Source, no installation or registration required.
Pricing:
- Open Source
#Calendar #Appointments and Scheduling #Encryption
Mailspring Landing Page
4

Mailspring

Mailspring is a mail client for Mac, Windows and Linux.
Pricing:
- Open Source
#Email #Email Clients #Calendar 25 social mentions
Nextcloud Calendar Landing Page
5

Nextcloud Calendar

The Calendar app is a user interface for Nextcloud's CalDAV server.
Pricing:
- Open Source
#Calendar #Appointments and Scheduling #Email 4 social mentions
iRedMail Landing Page
6

iRedMail

A fully fledged, free email server solution, an open source project (GPL v2).
Pricing:
- Open Source
#Email #SMTP Server #Self-hosted Email 2 social mentions
Tutanota Landing Page
7

Tutanota

Get your encrypted mailbox for free.
Pricing:
- Open Source
#Email #Email Clients #Enterprise Communication 177 social mentions
Mailpile Landing Page
8

Mailpile

Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.
Pricing:
- Open Source
#Email #Email Clients #Email Management
Spark Mail Landing Page
9

Spark Mail

Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues
Pricing:
- Open Source
#Email #Email Clients #Calendar 30 social mentions
NeoMutt Landing Page
10

NeoMutt

NeoMutt is a command-line mail reader. It's a version of https://alternativeto.
Pricing:
- Open Source
#Email #Email Clients #Calendar 10 social mentions
Calendar Landing Page
11

Calendar

Calendar app is an online calendar and team scheduling software for people like me and you. We make it easy to schedule appointments on your calendar.
Pricing:
- Open Source
#Appointments and Scheduling #Appointment Scheduling #Meeting Scheduling 2 social mentions