iTimer

iTimer is a lightweight and portable application that puts an alarm clock at your disposal, enabling you to set audio alerts to go off on countdown. It also has a stopwatch.

The entire program's wrapped in a single .exe file that you can save to a custom location on the disk and simply double-click. Another possibility is to keep it stored on a USB flash drive, in order to directly run it on any PC without any previous setup. It doesn't make any changes to the Windows registry or create additional files on the HDD without your permission.

As far as the interface is concerned, iTimer adopts a standard window with a seemingly plain appearance. However, the options are not that intuitive.

It's possible to show or hide the seconds, minutes, hours, days and years, specify the numerical values, and click a button to start the timer. It can be canceled if you change your mind. Moreover, you can set it to beep until instructed to stop, and it can cover the entire screen with any color you select.

You can view the system time and 24-hour clock mode, restore all settings to default, as well as reset the timers. Buttons are available for cutting, copying, pasting and clearing data. Apart from the fact that keyboard shortcuts are supported, there are no other notable features available here.

It didn't put a strain on the computer's performance in our tests, thanks to the fact that it needed a low amount of CPU and RAM to work properly. No error dialogs popped up and it didn't hang or crash.

On the other hand, the options are not that intuitive, especially for inexperienced users. However, you can test iTimer for yourself, since it's free.