Calcurse is a text-based calendar and scheduling application

Important features:

* fast and customizable curses-based interface

* user-definable key bindings

* fully user-configurable notification system (ability to send mails or
  anything else that could remind you of your upcoming appointments)

* moon phases calculation

* import capabilities with support for iCalendar format

* export capabilities with support for iCalendar and pcal formats

* ability to attach notes to each calendar element, and to edit them with your
  favorite text editor

* support for internationalization with texts and manual translated in English,
  French, German, Dutch, Spanish and Italian

* complete online help system