Kana Reminder - Kana Reminder is a program which can be used to set a reminder to be triggered at a specified time.
Crontab UI - Easy and safe way to manage your crontab file
Desktop-Reminder - Desktop-Reminder is a freeware task planner for Windows to manage your tasks and other to-dos’ in really easy way.
Scheduled tasks - GNOME GUI for configuring a users' cron (automatic jobs). Some of its features are:
Memo to Me - Online email & SMS reminder service.
024h Lucky Reminder - 024h Lucky Reminder is a reminder software for home and office.