"Alarm Clock is like KAlarm minus the email scheduler. With it, you
can schedule commands, shell scripts, and tasks like locking the
screen and shutting the computer down. But since we're talking
about desktop alarm clocks, I would say that "Alarm Clock" is
really cool as you can simply use or set any audio files as your
alarm sound with it.
"Yes, I'm talking about the famous Linux audio player. XMMS has an
alarm plugin that could come in handy if you are in need of an
easy-to-use desktop alarm clock."