Top 12 Open-Source Alternatives to Rainlendar

Product categories

APIs Appointment Booking Appointment Scheduling Appointments and Scheduling Calendar Calendar And Scheduling Email Email Clients Enterprise Communication Productivity SMTP Server Self-hosted Email

Summary

The top open-source alternatives to Rainlendar 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
Compass Calendar App Landing Page
4

Compass Calendar App

Calm calendar for productive people
Pricing:
- Open Source
#Calendar #Calendar And Scheduling #Calendar App
Tutanota Landing Page
5

Tutanota

Get your encrypted mailbox for free.
Pricing:
- Open Source
#Email #Email Clients #Enterprise Communication 177 social mentions
Mailspring Landing Page
6

Mailspring

Mailspring is a mail client for Mac, Windows and Linux.
Pricing:
- Open Source
#Email #Email Clients #Calendar 25 social mentions
SOGo Landing Page
7

SOGo

SOGo is groupware server with a focus on scalability and open standards.
Pricing:
- Open Source
#Email #Email Clients #Self-hosted Email 1 social mentions
Roundcube Landing Page
8

Roundcube

Web-based IMAP email client
Pricing:
- Open Source
#Email #SMTP Server #Email Clients 16 social mentions
Rainloop Landing Page
9

Rainloop

RainLoop is a web based email client.
Pricing:
- Open Source
#Email #Email Clients #Email Management
Calendar Landing Page
10

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
Dudle Landing Page
11

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
Cal.com Landing Page
12

Cal.com

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