sophisticated calendar and alarm program - Tk GUI interface

 Remind allows you to remind yourself of upcoming events and
 appointments. Each reminder or alarm can consist of a message sent
 to standard output, or a program to be executed.
 .
 It also features: sophisticated date calculation, moon phases,
 sunrise/sunset, Hebrew calendar, alarms, PostScript output, tcl/tk
 front-end and proper handling of holidays.
 .
 Tkremind provides a GUI which allows viewing a calendar and adding or editing
 reminders without learning the syntax of Remind.