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

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

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. ... You can configure 1st Atomic Time to operate as a time server. ... 1st Atomic Time hides in a small icon near the taskbar clock and does not require desktop space. ... 1st Atomic Time can adjust the system time correctly even if you have irregular Windows time zone settings.
http://www.atom-time.com/download/1st-atomic-time.exe - 707Kb - Download - Screenshot

On-Time Atomic Clock Sync
Synchronize your PC's clock with internet atomic clock servers
http://calendarconstructer.com/on_time_atomic_clock_sync.exe - 420Kb - Download - Screenshot

Atomic Clock Sync
This freeware Atomic Clock Sync utility can help you keep your local computer up-to-date with the exact current time. This program will reference an atomic clock server to get the current time with the greatest accuracy available and update your PC's information. ... Atomic Clock Sync will connect to one of the time servers operated by the National Institute of Standards and Technology (NIST) in the United States, and will compare the time of your computer with the time on the servers operated by the NIST.
http://www.worldtimeserver.com/atomic-clock/atomic.exe - 628Kb - Download - Screenshot

2D_Gold_Clock Screensaver
Synchronize your local PC time using the Atomic Clock servers. Collection of various analog clock with synchronization your local PC time using the Internet(Uses the National Institute of Standards and Technology (NIST) Atomic Clock servers). Choosing various dial, various arrows, choosing... The most different variants of clock on every day! ... Having switched on a casual choice you receive new clock at each start.
http://www.all-sweets.com/download/2d_gold_clock.exe - 468Kb - Download - Screenshot

Attache Transparent Clock
Transparent desktop clock with fully customizable shape, alarms, and atomic time. It may have a digital or analog clock face of various colors, sizes and shapes - you may even set individual parameters for each application you run, so that the clock were clearly visible in any environment. ... This state-of-the-art piece of software may be used as a beautiful replacement for standard Windows digital clock or as an alarm-clock/reminder, to help you stop forgetting your friends' birthdays and other important but not so easy to memorize events.
http://www.softdemon.com/attclock.zip - 1Mb - Download - Screenshot

The Time Machine
Professional looking clocks, skinable calendar, atomic synchronizer and organizer. The Time Machine is a massive set of components and functions, completely covering all the tasks of managing your computer clocks. That includes managing appearance of clocks, display of various time zones,... - Highly customizable digital and analog clocks with a powerful skin engine; - Integration of the clocks in a Windows environment.
http://www.atlantsoft.com/utils/store/ttmsetup.zip - 4Mb - Download - Screenshot

AtomSync
AtomSync is a utility that works in the background and periodically checks your system time against an internet NTP time server or against a computer in your LAN (local network) which runs an AtomSync LAN time server. It also displays a nice graphical clock with time and date on your desktop and... the AtomSync is German an means atomic clock) lets you synchronize you computer or lan with the nation's reference time over any internet connection and with a precision in the milliseconds range. ... Internet time servers usually deliver an extremely precise time which is often synchronized...
ftp://ftp.emtec.com/atomsync/atomsync.exe - 904Kb - Download - Screenshot