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
Digital Clock 4 - Beautiful customizable clock with plugins
VisualCron - VisualCron is an automation, integration and task scheduling tool for Windows.
Free Alarm Clock - Free Alarm Clock is a free, full-featured and user-friendly computer alarm clock for Windows.
Freebyte Task Scheduler - Freebyte Task Scheduler, freeware for Windows and Linux/Wine.