My Time Wizard
If you use MyTimeWizard your computer clock will permanently stay in sync with an atomic clock. The atomic clocks are the base for most accurate time measurements available. You will now have the chance of taking your computer clock as a reference for all clocks in the house. ... You won't even have to check the time as MyTimeWizard even warns you about your schedule by making use of events.
http://www.racsoftware.com/downloads/timewizard.exe - 2Mb - Download - Screenshot

Atomic PC Clock
Atomic PC Clock allows you to synchronize your personal computer with the National Institute of Standards and Technology atomic time servers, ensuring you always have your local time accurately listed on your computer. It also offers two different types of monthly calendars and an intuitive user... Monitor exact time on your PC: Atomic PC Clock will synchronize with atomic time servers at specified intervals, so you do not need to manually check the accuracy of the system time on your computer every hour.
http://www.atomicpcclock.com/atomicclock.exe - 656Kb - Download - Screenshot

Atomic Alarm Clock
Alert yourself about important events with different alarms and replace your Windows tray clock using different skins. Computer alarm clock that will play a MP3 file. It also can run a program, log off, reboot, shut down, or power off. Atomic Alarm Clock also an atomic-time synchronizer and... This computer alarm clock is built into your personal PC and is completely customizable. ... Nice Computer Alarm Clock! ... Support Longhorn clock style. ... See the time, seconds, day, date and system UpTime in different skins.
http://www.drive-software.com/download/ataclock.zip - 1Mb - Download - Screenshot

Chronos Atomic Clock Synchronizer
Chronos Atomic Clock Synchronizer is a utility for people who need their computers to use exact time. The program connects to various atomic clock timeservers and synchronizes your internal clock with time provided by these servers. Key benefits: connects on many atomic clock time servers; you... Some other features: starts up automatically minimized to the tray; updated server list; shorter latency time for synchronizing; faster connection to the sync servers. ... 1 seconds.
http://www.aresgalaxyonline.com/downloads/chronos_setup.exe - 761Kb - Download - Screenshot

#1 Atomic Clock
Atomic Clock lets you synchronize your computer's clock with any Internet atomic clock (time server). It uses a high-precision network time protocol (NTP) which provides accuracy of several milliseconds depending on the characteristics of the synchronization source and network paths. ... Features: Skinned, Work as Time Server, Synchronize Periods, Import Time Servers List!
http://www.freefileszone.com/atomic-clock/download/acdemo.exe - 488Kb - Download - Screenshot

PresenTense NTP Auditor
PresenTense NTP Auditor monitors your computer's built-in clock and compares it's time to the real time. Most computer clocks lose or gain time so within a few days, your computer does not show the real time. Many software packages claim to synchronize your computer to atomic clocks or satellite... PresenTense NTP Auditor can save logs for days, months and years so you can PROVE what time your computer had at any given point. ... PresenTense Auditor allows you to monitor and record your computer's time and graph the difference between it and up to three national reference clocks on the...
http://www.bytefusion.com/download/bin/ptademo.exe - 2Mb - Download - Screenshot

Parallaxis Cuckoo Clock
Computers can be boring and mundane, why not spice it up a bit, with a new Cuckoo Clock. There is a lot of breathtaking graphics on Cuckoo Clock - classical clock, futuristic clock, office clock, even Big Ben is included! This program is all your timekeeping needs in one package: see the time... This software makes a refreshing change to the normal mundane PC clock, why not try it yourself. ... Customize alarm/clock sounds and messages. ... Download a lot of free themes, skins and collection.
http://www.pxcompany.com/download/cuckoo/cuckoo_en.exe - 2Mb - Download - Screenshot

1st Atomic Time
1st Atomic Time keeps the system time accurate on your computer or any computer in your network. It synchronizes your PC clock with Internet atomic time servers. You can pick the fastest and most reliable servers from the built-in list of more than 150 choices or add your own. ... 1st Atomic Time hides in a small icon near the taskbar clock and does not require desktop space. ... Also, 1st Atomic Time can synchronize the time at Windows startup without wasting your computer's resources. ... Then you can ensure you have the exact time on any computer in your network.
http://www.atom-time.com/download/1st-atomic-time.exe - 707Kb - Download - Screenshot

AlfaClock
Ancient Egyptians used the shadow clock (gnomon) to determine correct time. The Greeks used the water clock, or clepsydra. The first mechanical clock appeared in the fourteenth century. Then, in 1929 first electronic timepieces appeared. As time changes, so do the time-keeping devices. ... Atomic Clock Synchronization feature allows you to periodically connect to atomic clock time servers to make sure that your computer displays correct time and adjust it automatically, if necessary. ... At first glance, AlfaClock is a regular taskbar clock (sometimes called "tray clock").
http://www.alfasoftweb.com/download/alfaclock_v1.84.exe - 2Mb - Download - Screenshot

ClockDummy!
ClockDummy! is an atomic clock, which can say the time with a real human voice, and enhance your standard taskbar clock with custom graphics, month, and seconds. ClockDummy! also keeps your clock updated to the exact second via an atomic clock Internet server for any time zone and location, and... lets you select from a range of predefined styles for how your taskbar clock should look, or select your own graphics and fonts to use. ... is the ultimate addon to the standard taskbar clock and it's easy to use!
http://www.dummysoftware.com/ClockSetup.exe - 1Mb - Download - Screenshot