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 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

happy clock
Get organized -- the fun and easy way! Happy Clock will keep you on schedule by automatically announcing the date, time or both at specified intervals using a pleasant male or female voice. Keep track of important time commitments with fully-customizable appointment reminders. ... Transform your boring taskbar time display into a colorful clock that can display both the date and the time. ... you also do it yourself SKIN,What's more, it is packed with alarms, atomic clock, calendar, timezones, and other time tools.
http://www.famousoft.com/soft/happyclock.exe - 3Mb - Download - Screenshot

Weather Alarm Clock
This is a clock program with weather that sits in your system tray and keeps you posted of current weather conditions, forecasts and more. You can customize the look of Weather Alarm Clock by changing any of the available skins! The clock displays the exact time using Internet atomic time servers. ... Replace your windows clock by skinnable Weather alarm clock! ... There are also several different alarm tones ready to alert you in your alarm clock.
http://www.respectsoft.com/download/WeatherAlarmClock12Setup.zip - 1Mb - Download - Screenshot

Chronograph Lite
Chronograph Lite is a simple freeware utility which main function is to synchronize your local PC time using the Internet. For that purpose it uses the National Institute of Standards and Technology (NIST) Atomic Clock servers. It will reference an atomic clock server to get the current time... Chronograph automatically detects local time zone and Daylight Saving Time correction (no manual settings needed). ... It is very stable, the program automatically connects to another server when the current server is down.
http://www.altrixsoft.com/download/chronolt.exe - 1Mb - 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

Click Clock
Click Clock is a clock, calendar, weather, and astronomy program. It shows your local temperature in the tray. It also shows local weather, animated weather radar, animated satellite images, date and time of sunrise, sunset, moonrise, moonset, equinoxes & solstices, moon phases, eclipses, meteor... The clock can automatically synchronize the computer clock with any atomic clock time server on the internet. ... There is no time limit. ... Click Clock is unique in that the calculation of rise and set times takes into account your altitude above sea level which can change these times by...
http://www.elegantpie.com/clickclock-setup.exe - 6Mb - 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

Global Time Synchronizer
Magneto Software Global Time Synchronizer is a versatile time keeping tool that has many features including the ability to modify the look of your standard desktop clock, an easy-to-use, convenient interface that uses skins to modify its appearance, and many other unique options. ... - Can be used as a floating (can be moved anywhere on the screen) clock or as a tray (replaces your current clock in the taskbar) clock. ... - Supports SNTP (the Simple Network time protocol, RFC 1769) - Time Protocol (RFC868) - Proxy support: Socks4/Socks4A/Socks5 - Date and time format is chosen according...
http://www.magnetosoft.com/downloads/maclocksetup.exe - 3Mb - Download - Screenshot

AtomTime Pro
AtomTime Pro is a Windows application which will connect to an atomic clock time server via the Internet and fetch the current atomic clock time value. It can then set your PC clock to the correct time. AtomTime Pro is the latest sequel to the very popular AtomTime98 and AtomTime95. ... Time Adjust on Connections: The time can now be adjust each time a Dial-Up Networking connection is formed. ... Time Formats: Support for more time formats. ... A partial list of the new features in AtomTime Pro include: User-Defined Time Servers: The user can now define their own list of time servers.
ftp://ftp.atomtime.com/atpro31d.exe - 564Kb - Download - Screenshot