Calundur was an event management tool used by mainly libraries in Sweden from 2015 to March 2023. It is now closed down.

It was very flexible and efficient, handling long series of events, sending messages and reminders to those who signed up, had support for over 40 languages, structure for searching through thousands of events, widgets that were easily configurable to match style of whichever website a subsection of the events should be shown at and much more.

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