Free Countdown Timer - Free Countdown Timer is a free, full-featured and user-friendly countdown timer for Windows
NetTime - nettime is a time & attendance software solution.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
Free Alarm Clock - Free Alarm Clock is a free, full-featured and user-friendly computer alarm clock for Windows.
TimeLeft - TimeLeft is a versatile desktop utility - it can be used as a countdown clock, reminder, clock...
KTimer - KTimer is a little tool to execute programs after some time.