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
A Much Simpler, Hassle-Free Way to Set Digital Alarms
Comprehensive Overview of UTC Global Clock
Simple clock and timer for Mac
Efficient Timer Application for Mac Users
Keep track of time in any time zone
A trial version app for Mac, by Embraceware.
Keep Track Of Your Time As You Move Between Projects.