Cal.diy
Calendar & ContactsOnline appointment scheduling system
Replaces Calendly, Doodle
Best Cross-Platform Calendar & Contacts for self-hosting
The 11 best Cross-Platform calendar & contacts you can self-host, ranked by community traction.
vdirsyncer
Calendar & ContactsSynchronize calendars and contacts via CalDAV/CardDAV
Replaces iCloud sync
Alf.io
Calendar & ContactsTicket reservation system
AgenDAV
Calendar & ContactsCalDAV web client with an Ajax interface
Replaces Google Calendar
DavMail
Calendar & ContactsPOP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users
Decsync Calendar Sync
Calendar & ContactsFile-based calendar and contacts synchronization
Replaces Google Calendar
hitobito
Calendar & ContactsManage complex group hierarchies with members, events and a lot more
GNOME Calendar
Calendar & ContactsSimple desktop calendar with CalDAV support
Replaces Google Calendar
Meetable
Calendar & ContactsMinimal events aggregator
KOrganizer
Calendar & ContactsCalendar and scheduling component of KDE Kontact
Replaces Outlook Calendar
Digistorm
Calendar & ContactsCreate collaborative surveys, quizzes, brainstorms, and word clouds
No apps match these filters.
Every option here is open-source and self-hostable, tagged Cross-Platform within the calendar & contacts category. Compare them on the individual app pages for setup difficulty and resource requirements.