Floating Stopwatch and Timer gives users the ability to keep a stopwatch or countdown timer on top of the screen above other apps.  After launching the stopwatch/timer just tap on the numbers to start the clock.  You can move the stopwatch/timer by dragging from the sides of the window.  You can close the stopwatch/timer from the notification.  In Android 4.1 Jelly Bean and above the user can access settings for the stopwatch/timer to quickly change style or the Timers time.