XDiary is a Motif/X Windows application that combines the functions of
a desktop calendar, an appointment book and an alarm clock. XDiary
will help you keep track of your meetings, appointments and plan
your time.

XDiary can be used as a stand-alone tool but it also contains all
the functions necessary to be used as a group calendar. As a group
calendar, XDiary will help you to plan meetings, distribute information
to specific groups etc.

Homepage:
https://www.ibiblio.org/pub/X11/contrib/office/xmdiary-README
