Digital Countdown Clock I Am Looking For Free Countdown Timer Software For A Presentation.?

I am looking for free countdown timer software for a presentation.? - digital countdown clock

I try to create a countdown to a decent laptop to lectures at the next conference. I searched and searched but can not find what I want. I need a digital clock to fill the screen, is to count down and let the speaker know how long he or she has stopped talking and, ideally, flash or change color timeout at the end.