The Calendar app is a user interface for Nextcloud's CalDAV server. Easily
sync events from various devices with your Nextcloud and edit them online.

 * Integration with other Nextcloud apps! Currently Contacts - more to come.
 * WebCal Support! Want to see your favorite team's matchdays in you
   calendar? No problem!
 * Attendees! Invite people to your events.
 * We're not reinventing the wheel! Based on the great davclient.js,
   ical.js and fullcalendar libraries.

WWW: https://apps.nextcloud.com/apps/calendar