Digital Clock 4 - Beautiful customizable clock with plugins
Scheduled tasks - GNOME GUI for configuring a users' cron (automatic jobs). Some of its features are:
System Scheduler - System Scheduler for Windows, Free Task Scheduler Software replace Microsoft Windows Task Scheduler
Kana Reminder - Kana Reminder is a program which can be used to set a reminder to be triggered at a specified time.
VisualCron - VisualCron is an automation, integration and task scheduling tool for Windows.
Auto Mail Sender - Auto Mail Sender Standard Edition official page. A powerful and easy-to-use eMail scheduler.