A free program for Android, by espengineer.

Chronometer is an easy-to-use, reliable time-tracking app, ideal for various activities, such as running, workouts, cooking, games, or work.

The stopwatch is easy to use, with the ability to measure the time since the last lap, as well as the current lap time. The stopwatch can also be used to count the number of laps in a race.

You can use the countdown timer to set a time and then count down to zero. When the time is up, you will receive a notification, according to your settings: a sound alarm, a vibration, and / or a message on the notification bar (if the app is running in background).