Organizers

Hamster is a free and open source program that allows you to keep track of the time of all events of the day in Linux

KAlarm is a free and open source program for setting reminders, as well as for scheduling command launches and sending emails

Getting Things Gnome (GTG) is a free and open source personal organizer/task manager inspired by the “Getting Things Done” (GTD) methodology

hmtimer (Hsiu-Ming’s Timer) – graphical computer shutdown timer and more