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. ... 1st Atomic Time can adjust the system time correctly even if you have irregular Windows time zone settings. ... You can configure 1st Atomic Time to operate as a time server. ... You can setup 1st Atomic Time to automatically adjust the time at specified intervals.
http://www.atom-time.com/download/1st-atomic-time.exe - 707Kb - 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. ... It outputs a port receiving buffer, extracts all NMEA sentences and counts check sum errors. ... $GPZDA, $ZQZDA or $GPRMC protocol sentences are explored as time source.
http://www.brigsoft.com/atomic-clock-sync/download/GpsTimeInst.exe - 447Kb - Download - Screenshot

Atom Time 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. Key Features: 1. Synchronize time with NIST atomic time servers 2. ... Display time in either local time or UTC/GMT 11. ... Periodically check and synchronize time 10. ... Can synchronize time with any server running SNTP or TIME protocol 9. ... Support SNTP (the Simple Network time protocol) 6.
http://www.lmhsoft.com/atsync.exe - 664Kb - Download - Screenshot

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 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

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... (*) This program uses the list of 19 presetting atomic time servers, that are situated all over the world (USA, UK, Australia, France, Germany etc. ... They are open NTP (Network Time Protocol) servers. ... (*) As a result you don't have to do anything, mostly the program is not wasting resources of...
http://www.brigsoft.com/atomic-clock-sync/download/BsAtomicInst.exe - 543Kb - Download - Screenshot

0S Non-Proxy Atomic Sync
A standard synchronizing program will not work if NTP (Network Time Protocol) is suppressed by a proxy or a firewall. This synchronizer uses plain access to WWW pages that show standard GMT time. It will work if you have access to Internet Web pages. ... The program uses three different time sources. ... The unique Time Offset feature of the program allows setting up your PC clock to gain or to lose for a specified interval. ... So as you see mostly the program is idle and is not wasting resources of your PC.
http://www.brigsoft.com/atomic-clock-sync/download/BSAtomicNPInst.exe - 522Kb - 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... Internet time servers usually deliver an extremely precise time which is often synchronized with a nation's or continent's atomic reference clock. ... Your system time is used for time stamps in emails, files internet requests and differences in system clocks can cause problem, especially when...
ftp://ftp.emtec.com/atomsync/atomsync.exe - 904Kb - Download - Screenshot

Chronograph
Chronograph Atomic Time Clock is a simple award-winning program which keeps your computer's clock accurate using atomic time servers of the National Institute of Standards and Technology (NIST). It has an easy-to-use nice-looking user interface and offers many useful features that make the... It lets you check the current time for any time zone. ... Chronograph is able to work as a time server, so you can synchronize you computers's clock not only to NIST servers but to any computer in your local network.
http://www.altrixsoft.com/download/chrono.exe - 2Mb - Download - Screenshot