1)   ActiveEarth 2.0
ActiveEarth is a world time clock with a gorgeous day/night merge of NASA's earth images in maps or a globe. It has accurate time zone data for more than 500 cities, atomic time sync, countdown clocks, scalable analog clocks, screen saver, and more!

 2)   Chronograph Lite 4.1
Chronograph is a simple award-winning program which synchronizes your local PC clock using atomic-time servers. It has an easy-to-use, nice-looking interface, so you can adjust your time with just two mouse clicks.

 3)   Desktop Atomic Clock 2.23
Desktop Atomic Clock is a program to synchronize your computer clock with an atomic clock over the Internet. You can choose to synchronize the time automatically or use the manual mode

 4)   Emsa Time Synchronizer 1.0.46
Emsa Time Synchronizer is a very simple but useful time synchronization utility. Users that like simplicity, may indeed like this program. It can continously update time in background and autorun at system startup. Freeware.

 5)   Chronograph 5.0
Chronograph is a simple award-winning program which keeps your computer's clock accurate using atomic time servers. It is able to replace the standard Windows clock in the system tray and uses Winamp skins for thousands of different styles.

 6)   Atom Time Synchronizer 3.7.9
AtomTime Synchronizer is a useful and handy utility to keep your PC clock accurate. It can periodically check and synchronize your computer time with a NIST atomic time server, or synchronize time between computers, and can also act as a time server

 7)   HiClock Pro 3.19
HiClock Pro gives you an easy and thorough way to synchronize your system clock to the exact time using the Internet. It queries one of the National Institute of Standards and Technology timeservers, which then returns the correct standard time.

 8)   1st Atomic Time 2.12
1st Atomic Time adjusts your system time with Internet atomic time servers. You can pick the fastest and most reliable servers and adjust the time automatically at regular intervals. 1st Atomic Time can work as a time server for any network.

 9)   1Click Time Synchronizer 1.0
1Click Time Synchronizer helps you keep your system time always accurate by synchronizing it with the highest precision atomic clock servers. The program features attractive skinnable interface and can work as a local time server on your LAN.

 10)   Atomic Clock Sync 2.7.0.3
This freeware Atomic Clock Sync utility will keep your local computer up-to-date with the exact current time from an atomic clock server.

 11)   Atomic PC Clock 1.2
Atomic PC Clock allows you to make the most of your time! By using Atomic PC Clock, you will not be late for important appointments. Atomic PC Clock's intuitive user interface is ideal for both the novice and expert PC user.