Top 12 Open-Source Alternatives to Google Calendar

Product categories

APIs Appointment Booking Appointment Scheduling Appointments and Scheduling Calendar Calendar And Scheduling Calendar App Email Email Clients Enterprise Communication Event Scheduling Productivity

Summary

The top open-source alternatives to Google Calendar are Simple Calendar, Calendar Lock PEA, and Nextcloud 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.

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
Calendar Lock PEA Landing Page
2

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
Nextcloud Calendar Landing Page
3

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
Cal.com Landing Page
4

Cal.com

Cal.com (formerly Calendso) is the open source Calendly alternative.
Pricing:
- Open Source
#APIs #Open Source #Calendar And Scheduling 53 social mentions
FullCalendar Landing Page
5

FullCalendar

FullCalendar is an open-source JavaScript event calendar.
Pricing:
- Open Source
#Appointments and Scheduling #Calendar #Appointment Scheduling 13 social mentions
Compass Calendar App Landing Page
6

Compass Calendar App

Calm calendar for productive people
Pricing:
- Open Source
#Calendar #Calendar And Scheduling #Calendar App
Calendar Landing Page
7

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
Rallly Landing Page
8

Rallly

Yes - with 3 Ls
Pricing:
- Open Source
#Appointments and Scheduling #Appointment Scheduling #Event Scheduling 8 social mentions
Dudle Landing Page
9

Dudle

Dudle is an online scheduling application, which is free and open source.
Pricing:
- Open Source
#Appointments and Scheduling #Appointment Scheduling #Event Scheduling 3 social mentions
Mailspring Landing Page
10

Mailspring

Mailspring is a mail client for Mac, Windows and Linux.
Pricing:
- Open Source
#Email #Email Clients #Calendar 25 social mentions
Spark Mail Landing Page
11

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
WeekToDo Landing Page
12

WeekToDo

Free and Open Source Minimalist Weekly Planner and To-Do list App Focused on Privacy
Pricing:
- Open Source
- Free
#Task Management #Productivity #Time Tracking 4 social mentions