An Empty BigBen Timer.  Press start to count up from 00:00 (perfect for individual event rounds):

A BigBen Timer counting down (while the timer is running all the buttons are disabled (except stop of course) to make sure you do not accidentally reset the timer!) :

Here is the list of Debate Timer Presets:

And here is what the NPDA timer looks like. Just click on any of the speeches to automatically load that timer: