Scheduled tasks - GNOME GUI for configuring a users' cron (automatic jobs). Some of its features are:

Task Scheduler - The Task Scheduler enables you to automatically perform routine tasks on a chosen computer. Task Scheduler does this by monitoring whatever criteria you choose (referred to as triggers) and then executing the tasks when their criteria are met.

Kana Reminder - Kana Reminder is a program which can be used to set a reminder to be triggered at a specified time.

System Scheduler - System Scheduler for Windows, Free Task Scheduler Software replace Microsoft Windows Task Scheduler

Auto Mail Sender - Auto Mail Sender Standard Edition official page. A powerful and easy-to-use eMail scheduler.

RoboIntern - An automation and scheduling software with focus on repetitive office tasks.