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The GNOME Task Scheduler (Gat) allows you to schedule and manage one-time and recurring tasks using a simple GNOME interface. Gat is a front-end for "cron" and "at" but should be simple enough that users can use it without prior knowledge of "cron" or "at."
Scary developmental release warnings
Gat is no longer being actively developed. I've tested it on Debian GNU/Linux and Ubuntu 12.04.
|Patrick Reynolds (email) | other projects|