Rainlendar project is a customizable desktop calendar.
Milo Calendar reads the dates stored by KOrganizer and displays them on your desktop in a clear, neat calendar.
A Thunderbird add-on that automatically exports the selected calendars in a defined folder
An add-on that optimizes your buttons end controls in Sunbird
Automatic ics-Export on Close is an extension that exports on close or after pressing the button selected calendars.