Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
Online timer - Online timer is a free and easy-to-use tool that comes with a very simple way to get done with measuring time and alarm.
Online Alarm Kur - Free online alarm clock, set alarm easily on your computer using the internet alarm clock without downloading any software, wake up in time with the loud online alarm clock.
Timer Tab - Online countdown timer, alarm clock, and stopwatch.
TIMEBOX - An advanced timer for professional meeting facilitators
Gestimer - For those little reminders during the day