Top 5 Open-Source Alternatives to Outlook on the Desktop

Product categories

Appointments and Scheduling Calendar Calendar And Scheduling Collaboration Databases Email Encryption Productivity Project Management Security & Privacy Spreadsheets Task Management

Summary

The top open-source alternatives to Outlook on the Desktop are Trello, Nextcloud Calendar, and Simple Calendar. 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.

Trello Landing Page
1

Trello

Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Pricing:
- Freemium
- Free Trial
- $12.5 / Monthly (Per user - Business Class)
#Project Management #Task Management #Productivity 231 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
Simple Calendar Landing Page
3

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
Calendar Lock PEA Landing Page
4

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
Hive Landing Page
5

Hive

Seamless project management and collaboration for your team.
Pricing:
- Open Source
- $12.0 / Monthly (Per user)
#Productivity #Project Management #Task Management 9 social mentions