Kontact - KOrganizer

It provides management of events and tasks, alarm notification, web export, network transparent handling of data, group scheduling, import and export of calendar files and more. It is able to work together with a wide variety of calendaring services, including NextCloud, Kolab, Google Calendar and others. KOrganizer is fully customizable to your needs and is an integral part of the Kontact suite, which aims to be a complete solution for organizing your personal data. KOrganizer supports the two dominant standards for storing and exchanging calendar data, vCalendar and iCalendar.

Features:

Support for multiple calendars and todo lists. Storage model. Undo and Redo. Todo integration with agenda view. Attachments for events and todos. Quick todo and event entries. Print support.