SOGo
Baïkal
Radicale
DAViCal
Xandikos
AgenDAV
Calypso
CalendarServer is a standards-compliant server implementation of the CalDAV and CardDAV protocols, including iMIP and APNS.

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Website, pricing, platforms and company facts side by side.
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CalendarServer
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| Website | calendarserver.org | open-gpt.app |
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When comparing CalendarServer and https://open-gpt.app/, you can also consider the following products.

SOGo is groupware server with a focus on scalability and open standards.
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The Radicale Project is a complete CalDAV (calendar) and CardDAV (contact) server solution.
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DAViCal is a server for calendar sharing.
Compare DAViCal to CalendarServer or https://open-gpt.app/:
Lightweight CalDAV/CardDAV server on top of Git.
Compare Xandikos to CalendarServer or https://open-gpt.app/:

AgenDAV is an Open Source CalDAV Web application.
Compare AgenDAV to CalendarServer or https://open-gpt.app/: