Ical is a Tk-based calendar program for X11 with the following features:
	* Calendar items can be created, edited and deleted easily.
	* Items can be made to repeat in various ways.
	* Ical will post reminders for upcoming appointments.
	* Ical can print and list item occurrences.
	* An ical calendar can include other calendars.
	* Ical calendars can be shared by different users.

Homepage:
https://launchpad.net/ical-tcl/
