Free
Alarm Clock
A free app for Mac, by Apalon
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A chronometer for your Mac
An alarm clock that sits on your computer's desktop
Simple clock and timer for Mac
Efficient Timer Application for Mac Users
A trial version app for Mac, by Embraceware.
A Much Simpler, Hassle-Free Way to Set Digital Alarms
Keep track of time in any time zone
Comprehensive Overview of UTC Global Clock
Keep Track Of Your Time As You Move Between Projects.