TimeLeft - TimeLeft is a versatile desktop utility - it can be used as a countdown clock, reminder, clock...
CountDown Kings Free Countdown Timer - CountDown Kings Free Countdown Timer is a free countdown timer for Mac OS X and Windows operating systems.
Smart Sloth - Smart Sloth uses the concept of timeboxing, which is to allocate a set amount of time to each task, therefore, creating a deadline which can increase the productivity of the user.
Final Countdown - Final Countdown is a simple countdown timer just like sleeper timer on your TV that will work despite the fact your PC is powered off.
ChirpyTime - ChirpyTime: Timer / Alarm Clock / Clock app for iPhone / iPod Touch
Free Timer - Free Timer is a fully featured countdown timer for the Windows operating system by using which you can easily set the countdown timers to get the information of remaining time.