Cal.diy
Calendar & ContactsOnline appointment scheduling system
Replaces Calendly, Doodle
Best Free Calendar & Contacts for self-hosting
The 32 best Free calendar & contacts you can self-host, ranked by community traction.
OpnForm
Calendar & ContactsBeautiful open-source form builder
khal
Calendar & ContactsCommand-line calendar built on CalDAV
Replaces Google Calendar
DAVx5
Calendar & ContactsCalDAV/CardDAV sync client for Android
Replaces Google Calendar Sync, iCloud sync
Etar
Calendar & ContactsOpen-source Android calendar app that syncs over CalDAV
Replaces Google Calendar
vdirsyncer
Calendar & ContactsSynchronize calendars and contacts via CalDAV/CardDAV
Replaces iCloud sync
Bracket
Calendar & ContactsFlexible tournament system to build a tournament setup, add teams,
Alf.io
Calendar & ContactsTicket reservation system
calcurse
Calendar & ContactsText-based calendar and scheduling application
Replaces Google Calendar
AgenDAV
Calendar & ContactsCalDAV web client with an Ajax interface
Replaces Google Calendar
Claper
Calendar & ContactsThe ultimate tool to interact with your audience (alternative
DavMail
Calendar & ContactsPOP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users
Nextcloud Tasks
Calendar & ContactsCalDAV task list app for Nextcloud
Replaces Google Tasks, Todoist
Decsync Calendar Sync
Calendar & ContactsFile-based calendar and contacts synchronization
Replaces Google Calendar
OpenSlides
Calendar & ContactsPresentation and assembly system for managing and projecting agenda,
Manage My Damn Life
Calendar & ContactsManage my Damn Life (MMDL) is a self-hosted front end for managing
Framadate
Calendar & ContactsOnline polling and meeting scheduling tool
Replaces Doodle
Thunderbird Appointment
Calendar & ContactsSelf-hostable scheduling tool for booking meetings
Replaces Calendly, Doodle
Crab Fit
Calendar & ContactsOpen-source group availability finder for scheduling meetings
Replaces When2meet, Doodle
hitobito
Calendar & ContactsManage complex group hierarchies with members, events and a lot more
ClearFlask
Calendar & ContactsCommunity-feedback tool for managing incoming feedback
Christmas Community
Calendar & ContactsCreate a simple place for your entire family to use to find gifts
EteSync DAV
Calendar & ContactsLocal CalDAV bridge for EteSync encrypted accounts
Replaces iCloud Calendar
Seatsurfing
Calendar & ContactsWebbased app to book seats, desks and rooms for offices
Bitpoll
Calendar & ContactsConduct polls about dates, times or general questions
GNOME Calendar
Calendar & ContactsSimple desktop calendar with CalDAV support
Replaces Google Calendar
Meetable
Calendar & ContactsMinimal events aggregator
Revel
Calendar & ContactsCommunity-focused event management and ticketing platform
KOrganizer
Calendar & ContactsCalendar and scheduling component of KDE Kontact
Replaces Outlook Calendar
InfCloud
Calendar & ContactsWeb client for CalDAV and CardDAV servers
Replaces Google Calendar web
Horde Kronolith
Calendar & ContactsCalendar application from the Horde groupware suite
Replaces Google Calendar, Exchange
Digistorm
Calendar & ContactsCreate collaborative surveys, quizzes, brainstorms, and word clouds
No apps match these filters.
At a glance
| App | Deploy effort | Difficulty | Min. RAM | License | ★ Stars |
|---|---|---|---|---|---|
| Cal.diy | Read-the-docs project | Medium | 512 MB | MIT | 48,984 |
| OpnForm | Under-an-hour setup | Medium | 512 MB | AGPL-3.0 | 3,833 |
| khal | Read-the-docs project | Medium | 64 MB | MIT | 3,073 |
| DAVx5 | Read-the-docs project | Easy | 128 MB | GPL-3.0 | 2,949 |
| Etar | Read-the-docs project | Medium | 256 MB | GPL-3.0 | 2,620 |
| vdirsyncer | Read-the-docs project | Medium | 64 MB | BSD-3-Clause | 1,888 |
| Bracket | Under-an-hour setup | Medium | 512 MB | AGPL-3.0 | 1,742 |
| Alf.io | Read-the-docs project | Medium | 512 MB | GPL-3.0 | 1,616 |
| calcurse | Read-the-docs project | Easy | 16 MB | BSD-2-Clause | 1,308 |
| AgenDAV | Under-an-hour setup | Medium | 128 MB | GPL-3.0 | 831 |
Quick picks
- Most adopted: Cal.diy (48,984 GitHub stars).
- Lightest footprint: calcurse (from 16 MB RAM, against 512 MB for the heaviest here).
- Licensing: 12 of 32 use GPL-3.0; check the rest individually if you plan to modify and redistribute.
Every option here is open-source and self-hostable, tagged Free within the calendar & contacts category. Deploy effort is graded from published container recipes, not vendor claims — see the methodology.