Calendars & Contacts (CalDAV/CardDAV)
10 self-hosted open source alternatives in this category
10 services found
Cal.com
Open scheduling infrastructure for teams and individuals
39.6k
11.5k
Last commit: 1d ago
Open-source scheduling platform for booking meetings with availability, team routing, integrations, and embeddable booking pages.
Alternative to:
Calendly+9
Nextcloud
Self-hosted collaboration platform for files, chat, and groupware
33.8k
4.7k
Last commit: 2d ago
Open-source, self-hosted content collaboration: file sync & share, groupware, chat, and optional office collaboration with strong admin and compliance controls.
Alternative to:
Dropbox+3
Monica
Personal CRM to organize relationships and interactions
24k
2.4k
Last commit: 4mo ago
Monica is a personal CRM that helps you manage contacts, log interactions, set reminders, and keep structured notes to maintain better personal and professional relationships.
Alternative to:
Notion+3
Mail-in-a-Box
A mail server in a box with a modern admin panel.
15.1k
1.5k
Last commit: 6d ago
Turn a fresh Ubuntu server into a complete mail server with webmail, DNS, spam filtering, automatic TLS, and an easy-to-use admin control panel.
Alternative to:
Google Workspace+7
ownCloud
Enterprise file sync and sharing with strong governance
8.7k
2.1k
Last commit: 27d ago
Self-hosted file sync and sharing platform with web/mobile/desktop clients, WebDAV access, sharing controls, versioning, and enterprise-grade security and auditing.
Alternative to:Dropbox+7
Rallly
Schedule group events with polls and shareable links
4.9k
489
Last commit: 2d ago
Self-hosted scheduling polls for finding the best time to meet, with shareable links, time zone support, reminders, and optional participant voting.
Alternative to:
Doodle+4
OpenEMR
Open source electronic health records and practice management
4.6k
2.7k
Last commit: 2d ago
A full-featured EHR/EMR and medical practice management system with scheduling, e-prescribing integrations, billing/claims support, patient portal, and reporting.
Alternative to:
MyChart+9
Radicale
Lightweight CalDAV/CardDAV server with simple setup
4.3k
491
Last commit: 2d ago
A fast, lightweight CalDAV/CardDAV server for syncing calendars, contacts, and tasks with standard clients, featuring filesystem storage and flexible authentication.
Alternative to:Google Workspace+4
Baïkal
Lightweight CalDAV and CardDAV server for calendars and contacts
3k
304
Last commit: 4d ago
Baïkal is a lightweight CalDAV/CardDAV server for syncing calendars, tasks, and contacts with DAV clients, with a simple web admin UI and multi-user support.
Alternative to:
Google Calendar appointment scheduling+4
sabre/dav
PHP WebDAV, CalDAV, and CardDAV server library
1.7k
362
Last commit: 5d ago
A PHP library for building WebDAV, CalDAV, and CardDAV servers with RFC-compliant protocol support, extensible plugins, and integration with existing authentication and storage backends.
Alternative to:Google Calendar appointment scheduling+5