Timer GUI utility

Question

I'm looking for a GUI utility which you can use to set a timer to go off after a fixed amount of time. When it goes off there some sort of strong visual notification.

Required features:

• Works on Linux
• Works on x86_64 machines
• Works with X windows
• Gratis
• Small size
• Uses very little system resources

Desired features:

• Ability to set a message which pops up when the time is up
• Audio notification in addition to the visual one
• Option for "XYZ minutes left" notifications
• Taskbar indicator for amount of time left
• Allows setting an alarm for a fixed date and time rather than a timer for an interval
• Stopwatch
• Libre software
• Not too ugly or tacky (I know this is subjective)
• Can match desktop environment theme

Answer 1

If you're using XFCE4, there's a panel plugin which has this functionality - sort of. It's for taking "breaks" every fixed amount of time. So if you want to wait XYZ minutes, set the time between breaksk to XYZ, set the break time to whatever you like, then reset the timer.

You'll now have a taskbar timer counting back to 0 from XYZ, and when reaching 0 it will bring up a message (albeit not the one you may have wanted).

Answer 2

Alarm Clock runs on the Openbox window manager, among others:

Alarm Clock is a fully-featured alarm clock for your GNOME panel or equivalent. It's easy to use yet powerful with support for multiple repeatable alarms, as well as snoozing and a flexible notification system.

Among its features:

Alarm Clock will notify you of an alarm by either playing a sound or starting your favorite music player! You can of course specify which sound you would like to use and whether it should be repeated or not. It’s also possible to specify a custom command to run instead of the pre-defined media players.

A notification bubble will appear when an alarm goes off, just in case you missed the sound.