Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
TimeLeft - TimeLeft is a versatile desktop utility - it can be used as a countdown clock, reminder, clock...
NetTime - nettime is a time & attendance software solution.
Free Alarm Clock - Free Alarm Clock is a free, full-featured and user-friendly computer alarm clock for Windows.
XNote Stopwatch - Try the most feature-rich stopwatch and timer software on the net for free!
KTimer - KTimer is a little tool to execute programs after some time.