(alphabetically sorted)
Besides PluginTrackerCalendar, you can also see through a Calendar tracker items associated with a standard tracker calendar. See:
And of course:
You can also export it (all or some fields and items, eventually filtered by some criteria), edit the data elsewhere, and re-import it if needed later on, etc. See:
And you can edit data inline in forms, if you enable the corresponding parameter to do so. See: