10 tools · 1 category

Open-source alternatives to Google Calendar

Google Calendar stores calendars and contacts and syncs them to clients. The list below is every catalog tool tagged Calendar & Contacts, which is the closest the catalog gets to the same job; none of them has been checked feature by feature against Google Calendar.

Tool	What it is	License	Stars	Last release	Commits 3mo
Radicale Simple calendar and contact server with extremely low administrative overhead. GPL-3.0 · released 2026-09-03	Simple calendar and contact server with extremely low administrative overhead.	GPL-3.0	4,977	v3.8.02026-09-03	195
Baïkal Lightweight CalDAV and CardDAV server based on sabre/dav. GPL-3.0 · released 2026-08-05	Lightweight CalDAV and CardDAV server based on sabre/dav.	GPL-3.0	3,294	0.12.12026-08-05	12
SabreDAV Open source CardDAV, CalDAV, and WebDAV framework and server. MIT · released 2026-07-07	Open source CardDAV, CalDAV, and WebDAV framework and server.	MIT	1,721	4.7.12026-07-07	38
Keeper.sh Calendar syncing tool that pulls and pushes events between calendar sources and destinations via iCal/ICS or OAuth, with support for anonymized busy/free events. AGPL-3.0 · released 2026-08-31	Calendar syncing tool that pulls and pushes events between calendar sources and destinations via iCal/ICS or OAuth, with support for anonymized busy/free events.	AGPL-3.0	1,293	v2.23.32026-08-31	250
DavMail POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to use any mail/calendar client with an Exchange server, even from the internet or behind a firewall through Outlook Web Access. GPL-2.0 · released unknown	POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to use any mail/calendar client with an Exchange server, even from the internet or behind a firewall through Outlook Web Access.	GPL-2.0	756	n/ano date	165
Davis A simple, dockerizable and fully translatable admin interface for sabre/dav based on Symfony 5 and Bootstrap 4, largely inspired by Baïkal. MIT · released 2026-09-06	A simple, dockerizable and fully translatable admin interface for sabre/dav based on Symfony 5 and Bootstrap 4, largely inspired by Baïkal.	MIT	746	v5.4.42026-09-06	4
Manage My Damn Life Manage my Damn Life (MMDL) is a self-hosted front end for managing your CalDAV tasks and calendars. GPL-3.0 · released 2026-07-11	Manage my Damn Life (MMDL) is a self-hosted front end for managing your CalDAV tasks and calendars.	GPL-3.0	632	v0.9.32026-07-11	17
Xandikos Open source CardDAV and CalDAV server with minimal administrative overhead, backed by a Git repository. GPL-3.0 · released 2026-08-31	Open source CardDAV and CalDAV server with minimal administrative overhead, backed by a Git repository.	GPL-3.0	602	v0.4.62026-08-31	54
dayGLANCE Day planner with drag-and-drop time blocking, inbox, recurring tasks, habits, routines, goals, projects and Pomodoro focus mode, plus iCal and CalDAV calendar sync. Data stays in the browser, with optional WebDAV or GLANCEvault sync. MIT · released 2026-08-25	Day planner with drag-and-drop time blocking, inbox, recurring tasks, habits, routines, goals, projects and Pomodoro focus mode, plus iCal and CalDAV calendar sync. Data stays in the browser, with optional WebDAV or GLANCEvault sync.	MIT	127	v4.7.02026-08-25	1,170
DAViCal Server for calendar sharing (CalDAV) that uses a PostgreSQL database as a data store. GPL-2.0 · released unknown	Server for calendar sharing (CalDAV) that uses a PostgreSQL database as a data store.	GPL-2.0	111	n/ano date	n/a

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