gkrellm-reminder binary package in Ubuntu Oracular amd64

 A useful reminder plugin for gkrellm that can remind you of important
 events. Events can be scheduled inside gkrellm's configuration and
 will be displayed in gkrellm-reminder's panel.
 .
  * Events can be scheduled to repeat over an interval of days.
  * Events can repeat after a certain number of days or based on the
    day of the week
  * Reminders can be set to display early to ensure you'll be on time
  * Reminders can be repeated later, if necessary
  * Runs entirely within gkrellm

Source package