LFX Platform

Know more about LFX Platform

LFX Insights

Calendar Applications

Open‐source calendar apps that provide event scheduling, calendar sharing, and CalDAV integration features—often deployed in self‐hosted, collaborative environments.

18 projects

22,485 contributors

$91M

Cal.com

Cal.com is an open-source scheduling infrastructure and meeting scheduling platform that allows users to share their availability and coordinate meetings. It provides customizable booking pages, calendar integrations, and automated scheduling workflows for individuals and organizations.

Contributors

7,694

Organizations

1,284

Software value

$41M

Nextcloud Calendar

A calendar application for Nextcloud that provides personal calendar management and scheduling functionality, allowing users to create, edit and share calendars within the Nextcloud platform.

Contributors

2,967

Organizations

536

Software value

$4.6M

Etar Calendar

Android open source calendar

Contributors

1,785

Organizations

221

Software value

$3.1M

Simple Calendar

Simple Calendar is an open-source Android calendar application focused on providing essential calendar functionality with a clean, minimalist interface. It offers features like event management, recurring events, daily/weekly/monthly views, and customizable widgets while maintaining privacy by working offline without requiring unnecessary permissions.

Contributors

1,591

Organizations

195

Software value

$1.3M

Radicale

A simple CalDAV (calendar) and CardDAV (contact) server.

Contributors

1,523

Organizations

357

Software value

$614K

Easy!Appointments

:date: Easy!Appointments - Self Hosted Appointment Scheduler

Contributors

1,356

Organizations

166

Software value

$3.7M

MeetingBar

MeetingBar is a macOS menu bar app that displays upcoming calendar meetings and provides quick access to join various video conferencing platforms directly from the menu bar. It supports multiple calendar services and meeting platforms like Zoom, Google Meet, and Microsoft Teams.

Contributors

912

Organizations

278

Software value

$266K

gcalcli

gcalcli is a command-line interface tool for Google Calendar that allows users to manage their calendar events and tasks from the terminal. It enables viewing, adding, editing, and deleting calendar events without using the web interface.

Contributors

777

Organizations

198

Software value

$258K

DAVx⁵

DAVx⁵ is an open-source CalDAV/CardDAV suite and sync app for Android. You can also access your online files (WebDAV) with it.

Contributors

749

Organizations

131

Software value

$2.7M

Android Persian Calendar

An open-source Persian calendar application for Android devices that provides date conversion, widgets, and Persian calendar functionality with support for Iranian holidays and events

Contributors

683

Organizations

41

Software value

$1.9M

Elementary Calendar

Elementary Calendar is a desktop calendar application for the elementary OS Linux distribution. It provides a clean, modern interface for managing events, appointments, and schedules while integrating with the elementary OS design language and ecosystem.

Contributors

564

Organizations

66

Software value

$425K

Rallly

Rallly is an open-source scheduling and collaboration tool designed to make organizing events and meetings easier.

Contributors

518

Organizations

137

Software value

$3.4M

sabre/vobject

A PHP library for parsing and manipulating iCalendar and vCard files, providing functionality to read, write, and manipulate these common data formats used for calendar events and contact information

Contributors

321

Organizations

90

Software value

$1M

Libical

Libical is an open source implementation of the iCalendar protocols and data formats. It provides a library for parsing, generating, and manipulating iCalendar data, supporting both C and C++ interfaces.

Contributors

252

Organizations

99

Software value

$3.2M

SOGo

SOGo is an open-source groupware server that provides collaborative calendar, mail, and address book management. It offers a modern web interface and supports multiple protocols including CalDAV, CardDAV, and IMAP.

Contributors

248

Organizations

49

Software value

$6.8M

Open Web Calendar

Open Web Calendar is a web application that embeds calendar feeds from iCal/ICS sources into websites, allowing users to display and share calendar events through an iframe or direct URL. It supports multiple calendar sources, customizable styling, and interactive viewing options.

Contributors

203

Organizations

30

Software value

$756K

Hebcal

Hebcal is a Jewish calendar and holiday calculation software that converts between Hebrew and Gregorian dates, generates candle lighting times, and provides information about Jewish holidays, Torah readings, and other religious observances.

Contributors

186

Organizations

26

Software value

$164K

EGroupware

EGroupware is an open-source enterprise collaboration and groupware solution that provides integrated tools for communication, project management, calendar sharing, contact management, and document handling. It offers a web-based interface for teams to manage tasks, share resources, and coordinate activities across an organization.

Contributors

156

Organizations

14

Software value

$16M

Looking for a project that’s not listed?