When I was teaching middle school science I was notorious for letting my kids out late for their next class. We either got caught up in a riveting discussion or in an exciting lab, that time just got away from us. Well, that comes to an end with Class Timer.
The Class Timer is a simple, web-based appilcation that allows you to either count up and use it as a stop watch, or count down and use it as a timer. You can give the timer a name and even have it play a sound when the timer is finished.