Free Windows Countdown Clock - Free Windows Countdown Clock is a free Windows countdown clock and date counter for the Windows operating systems.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Desktop Countdown Timer - Desktop Countdown Timer is a free to use countdown timer for the desktop environment of the Windows.
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
TimeLeft - TimeLeft is a versatile desktop utility - it can be used as a countdown clock, reminder, clock...
Pomodone - Pomodone is the easiest way to track your workflow using Pomodoro technique, on top of your current task management service.