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Best Free Calendar & Contacts for self-hosting

The 32 best Free calendar & contacts you can self-host, ranked by community traction.

Cal.diy

Calendar & Contacts

Online appointment scheduling system

Replaces Calendly, Doodle

★ 48.6k Medium setup MIT

OpnForm

Calendar & Contacts

Beautiful open-source form builder

★ 3.7k Medium setup AGPL-3.0

khal

Calendar & Contacts

Command-line calendar built on CalDAV

Replaces Google Calendar

★ 3.1k Medium setup MIT

DAVx5

Calendar & Contacts

CalDAV/CardDAV sync client for Android

Replaces Google Calendar Sync, iCloud sync

★ 2.9k Easy setup GPL-3.0

Etar

Calendar & Contacts

Open-source Android calendar app that syncs over CalDAV

Replaces Google Calendar

★ 2.6k Medium setup GPL-3.0

vdirsyncer

Calendar & Contacts

Synchronize calendars and contacts via CalDAV/CardDAV

Replaces iCloud sync

★ 1.9k Medium setup BSD-3-Clause

Bracket

Calendar & Contacts

Flexible tournament system to build a tournament setup, add teams,

★ 1.7k Medium setup AGPL-3.0

Alf.io

Calendar & Contacts

Ticket reservation system

★ 1.6k Medium setup GPL-3.0

calcurse

Calendar & Contacts

Text-based calendar and scheduling application

Replaces Google Calendar

★ 1.3k Easy setup BSD-2-Clause

AgenDAV

Calendar & Contacts

CalDAV web client with an Ajax interface

Replaces Google Calendar

★ 826 Medium setup GPL-3.0

Claper

Calendar & Contacts

The ultimate tool to interact with your audience (alternative

★ 804 Medium setup GPL-3.0

DavMail

Calendar & Contacts

POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users

★ 760 Medium setup GPL-2.0

Nextcloud Tasks

Calendar & Contacts

CalDAV task list app for Nextcloud

Replaces Google Tasks, Todoist

★ 707 Easy setup AGPL-3.0

Decsync Calendar Sync

Calendar & Contacts

File-based calendar and contacts synchronization

Replaces Google Calendar

★ 699 Medium setup GPL-3.0

OpenSlides

Calendar & Contacts

Presentation and assembly system for managing and projecting agenda,

★ 645 Medium setup MIT

Manage My Damn Life

Calendar & Contacts

Manage my Damn Life (MMDL) is a self-hosted front end for managing

★ 639 Medium setup GPL-3.0

Framadate

Calendar & Contacts

Online polling and meeting scheduling tool

Replaces Doodle

★ 600 Easy setup CECILL-B

Thunderbird Appointment

Calendar & Contacts

Self-hostable scheduling tool for booking meetings

Replaces Calendly, Doodle

★ 552 Medium setup MPL-2.0

Crab Fit

Calendar & Contacts

Open-source group availability finder for scheduling meetings

Replaces When2meet, Doodle

★ 531 Easy setup MIT

hitobito

Calendar & Contacts

Manage complex group hierarchies with members, events and a lot more

★ 480 Medium setup AGPL-3.0

ClearFlask

Calendar & Contacts

Community-feedback tool for managing incoming feedback

★ 451 Medium setup AGPL-3.0

Christmas Community

Calendar & Contacts

Create a simple place for your entire family to use to find gifts

★ 424 Medium setup AGPL-3.0

EteSync DAV

Calendar & Contacts

Local CalDAV bridge for EteSync encrypted accounts

Replaces iCloud Calendar

★ 331 Medium setup GPL-3.0

Seatsurfing

Calendar & Contacts

Webbased app to book seats, desks and rooms for offices

★ 315 Medium setup GPL-3.0

Bitpoll

Calendar & Contacts

Conduct polls about dates, times or general questions

★ 315 Medium setup GPL-3.0

GNOME Calendar

Calendar & Contacts

Simple desktop calendar with CalDAV support

Replaces Google Calendar

★ 300 Easy setup GPL-3.0

Meetable

Calendar & Contacts

Minimal events aggregator

★ 170 Medium setup MIT

Revel

Calendar & Contacts

Community-focused event management and ticketing platform

★ 109 Medium setup MIT

KOrganizer

Calendar & Contacts

Calendar and scheduling component of KDE Kontact

Replaces Outlook Calendar

★ 100 Medium setup GPL-2.0

InfCloud

Calendar & Contacts

Web client for CalDAV and CardDAV servers

Replaces Google Calendar web

★ 89 Easy setup GPL-3.0

Horde Kronolith

Calendar & Contacts

Calendar application from the Horde groupware suite

Replaces Google Calendar, Exchange

★ 10 Hard setup GPL-2.0

Digistorm

Calendar & Contacts

Create collaborative surveys, quizzes, brainstorms, and word clouds

Medium setup AGPL-3.0

Every option here is open-source and self-hostable, tagged Free within the calendar & contacts category. Compare them on the individual app pages for setup difficulty and resource requirements.