clocks
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Double-Check Your Clock At Time.is
Webapp Time.is compares your computer’s clock to an atomic clock (the “most accurate time source in the world”) to let you know how accurate your clock is.
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Timer Tab Combines Alarm Clock, Timer And Stopwatch
Chrome: Timer Tab is a free extension for Google Chrome that combines the functions of a countdown timer, alarm clock, and stopwatch, and has the ability to notify the user when an alarm goes off.