Remind is a sophisticated calendar and alarm program. It includes the
following features:

  * A sophisticated scripting language and intelligent handling of
    exceptions and holidays.
  * Plain-text, PostScript and HTML output.
  * Timed reminders and pop-up alarms.
  * A friendly graphical front-end for people who don't want to learn
    the scripting language.
  * Facilities for both the Gregorian and Hebrew calendars.
  * Support for 12 different languages.

WWW: https://dianne.skoll.ca/projects/remind/