A great online stopwatch and countdown especially designed with big buttons for tablets and mobiles, although it works perfectly well on computers as well.
http://ictmagic.wikispaces.com/ICT+%26+Web+Tools
This is a good stopwatch, countdown, and other timer tools site. Simple to use and great for tests or simply counting down the seconds to home time!
http://ictmagic.wikispaces.com/ICT+%26+Web+Tools
A simple, elegant html timer site with a stop watch, count down and alarm clock. Click at the bottom of the screen to customise the background and choose a YouTube videos which will play for the alarm or when the count down has finished.
http://ictmagic.wikispaces.com/ICT+&+Web+Tools