Timer by Ten

The time counts down in minutes and seconds; when it expires, a ring sounds, the display flashes, and the elapsed expired time is also shown on the display. The timer also counts up from zero, if the time is started at zero. A large, easy-to-read time display is shown in the dock, for quick reference.

Whats New in Version 1.4.0
Added support for Mountain Lion Notification Center.

What's New in Version 1.5.0
Holding down on the minutes or seconds buttons will continuously advance the minutes or seconds. Clicking on the timer display will bring up the set time window; a cancel button has been added to the set time window.