Open source caldav projects
Every project in the registry tagged caldav, ranked by real GitHub adoption.
Task manager with Todoist, Nextcloud & CalDAV support designed for GNOME
DavMail POP/IMAP/SMTP/CalDAV/CardDAV/LDAP Exchange and Office 365 Gateway - Synced with main subversion repository at
Manage My Damn Life (MMDL) is a self-hosted frontend for managing your CalDAV tasks and calendars.
Frequently asked questions
How many open source caldav projects are there?
This registry tracks 3 projects tagged caldav, with 7,082 GitHub stars between them. The most-adopted is planify at 5,688 stars.
Are these caldav projects free to use?
Yes — 3 of the 3 carry an explicit open-source licence across 2 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which caldav project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these caldav projects still maintained?
3 of the 3 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.