The Gymboss Interval Timer - simple, flexible interval timer. There are some programmed intervals and also the option to set up your own. Basic, straightforward and it works.
IF Timer - a very simple timer that you can set up to time your fasting. Click when you finish your last meal and choose how long you will be fasting. It tells you how long you have left and how long the fast has lasted. Basic....you could use your watch.....but it was free! Perfect for Eat Stop Eat style fasts.