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

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

Time Sync Pro
Time Sync Pro is an application that connects to one of the many atomic clock web servers, downloads the time to your PC and adjusts it. Time Sync Pro has many features including the automatic adjustment of your computer clock. It can automatically update the time every 3 hours. ... Time Sync Pro minimizes to your system tray, so it's out of your way while you work.
http://www.softcab.com/ftp/timesync.exe - 63Kb - Download - Screenshot

GPS Time and Test
It is a PC Clock synchronization program. The program synchronizes a PC Clock to the right time using artificial satellites. It is alternative solution to synchronizing with atomic clock using NTP(SNTP) and Internet. The program works in the interactive mode or in background. ... The product is free for users of BrigSoft products Atomic Clock Service, PC Atomic Sync and OS Non-Proxy Atomic Sync. ... Default protocol version is NMEA 0183. ... It outputs a port receiving buffer, extracts all NMEA sentences and counts check sum errors.
http://www.brigsoft.com/atomic-clock-sync/download/GpsTimeInst.exe - 447Kb - 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

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

12Ghosts Synchronize
Synchronize your PC time with an atomic clock via the Internet. This program simplifies the task to the outmost and sits conveniently to access in the startbar tray. 12-Sync adjusts the time repeatedly, automatically, and silently exactly on the dot. ... It waits for an Internet connection, then adjusts your clock at atomic precision, without your interaction. ... You will never have the wrong time again! ... It keeps a log file about all activities that you can limit to size or age.
http://12Ghosts.com/download/12sync.exe - 2Mb - Download - Screenshot

The Time Master
Need help with coping with time? The Time Master is the ultimate time management tool. Easily track the time you spend on your tasks with Work Timer. Be reminded with the multiple alarms and reminders feature. Have multiple world clocks with the World Time feature Have your PC's clock always... Have fun with tools like Stopwatch and Classic Sounds.
http://www.virtuoza.com/Files/TheTimeMasterSetup.exe - 2Mb - Download - Screenshot

PC Atomic Sync
(*) It is an atomic clock synchronizer with some useful features (time offset, synchronize periods, etc. ). The main idea of the program is to synchronize your PC's clock in the most reliable and resource-saving way. (*) The unique Time Offset feature of the program allows setting up your PC... (*) Clock in your PC needs to be corrected only several times a month. ... You can specify the correction period during which the program should synchronize your clock. ... Otherwise the program checks for Internet connection, then tries to synchronize your clock and ends its work if succeeded.
http://www.brigsoft.com/atomic-clock-sync/download/BsAtomicInst.exe - 543Kb - Download - Screenshot

Vorboils
Vorboils is an awesome 3D screen saver. It generates beautiful, random wormholes that wobble, mutate and amaze. Vorboils is highly configurable (currently supports 258 configurable options) and can even run in interactive mode! Vorboils can automatically generate funky wallpapers and... Sync the clock and your PC time to an online atomic clock (accurate to 1 second in 6 millions years)! ... Vorboils can sync your PC time to an on-line atomic clock, accurate to 1 second in 6 million years! ... It can display the current time on a 3D analogue or 2D digital clock both with many wacky...
http://www.boiledsweets.com/vorboils/bin/vorboilsdemo.zip - 8Mb - Download - Screenshot