Review of KOrganizer powered by the Slant community.
KDE official calendar, and a part of the Kontact suite
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Pros
Pro Multi-category
Pro Long-time support
Pro Integrated into KDE
It can be used by clicking on the datetime in the bottom right corner.
Pro Imports well from Google Calendar
Pro Easy and intuitive to use
Cons
Con Search events by text shows empty results for existing events
Con Has issues with recurring events with exceptions
Has trouble with recurring events that have exceptions to them. If recurring even has an exception to the pattern at some point KOrganizer seems to not display any of the recurring events. Thus making it useless for complex calendars. After verifying that the akonadi back end did have the full set of events, KOrganizer just does not interpret them correctly.