Clocks & Alarms

Timer
Sonoragraphics(Free)
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A chronometer for your Mac
Alarm Clock Pro
Koingosw(Trial version)
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Much more than just an alarm clock
Simple Floating Clock
Greg Weston(Free)
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Simple Floating Clock: A Handy Clock App for Mac
iClock
Script Software(Trial version)
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iClock: Simple and intuitive clock for personal computers
Event Reminder
Supermagnus(Free)
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Never forget important events
Alarm Clock
robbie-hanson(Free)
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Wake Up With Robbie-Hanson Alarm Clock
Handy Clock
Voros Innovation(Paid)
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Realistic and Flexible Timekeeping Application for Personal Computers
Alarm Clock for Desktop
Natalia Gavrylova(Paid)
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Alarm Clock for Desktop: A Convenient Desktop Alarm Clock
Pester
Nicholas Riley(Free)
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Simple Clock and Timer for Mac
AnyTime
MEA Mobile(Paid)
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AnyTime - Add Multiple Clocks to Your Taskbar