Top 4 Open-Source Alternatives to Kontact - KOrganizer

Product categories

Appointments and Scheduling Calendar Calendar And Scheduling Email Email Clients Encryption SMTP Server Security & Privacy Self-hosted Email

Summary

The top open-source alternatives to Kontact - KOrganizer are Simple Calendar, Nextcloud Calendar, 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 Calendar Landing Page
2

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
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
Roundcube Landing Page
4

Roundcube

Web-based IMAP email client
Pricing:
- Open Source
#Email #Email Clients #SMTP Server 16 social mentions