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

Parallaxis Cuckoo Clock
Computers can be boring and mundane, why not spice it up a bit, with a new Cuckoo Clock. There is a lot of breathtaking graphics on Cuckoo Clock - classical clock, futuristic clock, office clock, even Big Ben is included! This program is all your timekeeping needs in one package: see the time... This software makes a refreshing change to the normal mundane PC clock, why not try it yourself. ... Customize alarm/clock sounds and messages. ... Download a lot of free themes, skins and collection.
http://www.pxcompany.com/download/cuckoo/cuckoo_en.exe - 2Mb - 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 hides in a small icon near the taskbar clock and does not require desktop space. ... You can configure 1st Atomic Time to operate as a time server. ... 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

AlfaClock
Ancient Egyptians used the shadow clock (gnomon) to determine correct time. The Greeks used the water clock, or clepsydra. The first mechanical clock appeared in the fourteenth century. Then, in 1929 first electronic timepieces appeared. As time changes, so do the time-keeping devices. ... Atomic Clock Synchronization feature allows you to periodically connect to atomic clock time servers to make sure that your computer displays correct time and adjust it automatically, if necessary. ... com, you can have the atomic clock right on your desktop.
http://www.alfasoftweb.com/download/alfaclock_v1.84.exe - 2Mb - Download - Screenshot

Trouts Talking Internet Clock
* Liven up & personalize your desktop with an Analog Clock face using any picture you like * Add an analog clock to your system tray * Remember Birthdays, Anniversaries, Appointments, Meetings etc with a Message, Song, Multimedia Presentation or a Microsoft Agent character * Set applications to... * Dynamic Icons -Trout's Internet Clock's icons are functional clocks. ... * Customizable Language Support means you can easily change text and hints on TICs windows either to another language or to your own cooler wording.
http://chemware.co.nz/tic23_sw.exe - 947Kb - 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

DS Clock
DS Clock is a digital desktop clock that displays variable date, time, and time zone information built from the format string. The program allows you to fully customize its look and feel, and can synchronize your computer's clock with Atomic Time Servers. ... DS Clock also allows you to show a tool tip window with upcoming reminders of Calendarscope and supports Swatch Internet Time and Stopwatches. ... Real Westminster chimes are available. ... You can select any combination of date and time, pick custom colors and fonts, set custom sound to play at the top of the hour, etc.
http://www.dualitysoft.com/download/dsc16r.exe - 869Kb - Download - Screenshot

Ace Clock XP
AceClock is a skinable transparent desktop clock with organizer and stickers, skins support, atomic internet time synchronization, fully customizable see through display with tooltip and convenient interface, it is designed to suit any and all your needs. ... You will get voice time spelling in multiple languages, powerful alarms with templates, upcoming alarms, quick reminders, countdown and stopwatch timers, universal calendar with date calculator, different time zones support with reliable atomic clock synchronization and much, much more.
http://www.aceclock.com/files/aceclockxp.zip - 2Mb - Download - Screenshot

3D Hand Clock
Mesmerizing 3D hand clock with extremely intense vivid color effects while it spins against the stars. This screen saver is jammed pack with features such as weather, e-mail notification, dynamic wallpaper, atomic time, motion blur, particle systems, 19 clock movements, clock color schemes, CD... Add character and personalization to your computer desktop with this amazing screen saver. ... Bring color and visual awe to guests in your home or office.
http://www.brightbug.com/programs/3DHClock.exe - 5Mb - Download - Screenshot

AMI Ultimate Screen Clock
Integrate a sophisticated digital or analog clock with your Windows desktop, schedule reminders and other tasks up to a century in advance, keep your system clock accurate with an Internet atomic time server and display your clock as a Windows screen saver. ... Among its many talents, AMI Ultimate Screen Clock will sound nautical watch bells, tell you the time with an authentic cold-war era Soviet submarine clock, play your favorite tunes every day just after lunch, blank your screen with an orbiting digital clock made of neon tubes and much more.
ftp://www.mindworkshop.org/pub/.mindworks/UltimateScreenClock.exe - 3Mb - Download - Screenshot