Calendar Lock PEA - Calendar Lock PEA is an encrypted desktop calendar with a day, week and month view. The shown calendars are never stored unencrypted on your disk, but exist only in the RAM. Platform-independent, Open Source, no installation or registration required.

mcron - mcron is GNU's implementation of cron. It is a 100% compatible replacement for Vixie cron.

Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...

Anacron - Anacron is a periodic command scheduler. It executes commands at intervals specified in days.

UKs Kalender - This program helps you organizing your dates and tasks and reminds you of upcoming events.

fcron - Fcron is a scheduler designed for Unix/Linux systems, especially usefull when your system is not up all the day long.