This is a list of some of the calendaring applications that support the iCalendar format.

• iCal - Mac OS X compatible.
• Mozilla Calendar - Windows, Linux, Mac OS X compatible.
• eventSherpa - Windows compatible
• WinDates - Windows compatible
• PHP iCalendar - Windows, Linux, Mac OS X compatible (included in Tasks distribution).

Tasks creates iCalendars for each of your tasks. If you want to use these features, make sure iCalendars are enabled in your Preferences.