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

Network Time System
Network Time System is a full-featured Client\Server network time synchronization system that allows synchronization of all computers on the network clocks with Internet time servers or any other local source of synchronization. Network Time System allows creation of custom exact time source in... All major time protocols are supported including NTP, SNTP, DAYTIME and NTS (over TCP/IP, IPX, NetBEUI. ... This powerful software solution is ideal for networks of all sizes from small office local networks to large enterprise networks.
http://www.softros.com/downloads/nts.zip - 3Mb - Download - Screenshot

Network/Unplugged
Network/Unplugged provides a transparent synchronization and backup solution for today's remote and mobile workers. Users can operate in a Virtual Network environment when detached from the network, making Network/Unplugged's synchronization solution extremely easy to use. ... Network/Unplugged is very rich in features like open outlook backup, Offline Files and Folders, Incremental File Backup and synchronization, intelligent file level differencing, Synchronization over internet, Quick File Analysis, Secure Authentication, Secure Data Transfer, E-mail Alerts, Real Time Backup, Internet...
http://www.mobiliti.com/trial_netUP.html - 0b - 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. ... And it is this fact that defines the way the program works: the program runs when Windows starts, checks whether synchronization has been done this day already, and stops immediately if so. ... 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/BSAtomicNPInst.exe - 522Kb - Download - Screenshot

Chronos Clock
Do you need to keep track of time around the world, if so Chronos Clock will solve your problem. Chronos Clock, the desktop clock that is able to display multiple clocks and different time zones. Chronos Clock is simple to install and easy to use. If you need to know the time in other countries... * Internet time synchronization using NTP/SNTP time-servers, to keep your PC's clock right up to date. ... * If you wish to use the Internet time synchronization function then a suitable connection via a modem or LAN must be available.
http://dl.filekicker.com/send/file/156865-1P80/chronos.zip - 2Mb - Download - Screenshot

BubbleClock
BubbleClock are analog clocks and reminder with semitransparent effect (only Windows 2000/XP). Various kinds of clock skins. Synchronization your computer clock via the Internet NIST Internet Time Service of National Institute of Standards and Technology USA. ... Map of time zones with the indication of current time in each time zone (country). ... Various types of alarm.
http://www.vedos.com/bubbleclock.zip - 2Mb - Download - Screenshot

IBPTime
Implements the Internet Time Service (ITS) which allows users to synchronize their computer clocks via the Internet. The time information provided by the service is directly traceable to UTC. The service responds to time requests from an Internet client in several formats including the DAYTIME,... Features include built in access to more than 70 tested Internet Time servers, ease of maintenence - SNTP servers may be added, deleted and modified, support for manual and automated (task scheduler) time synchronization, implements text and quad URL formats, Get before Set validation and more...
http://pages.infinit.net/ibp/ibpt/ibpt150.zip - 1Mb - Download - Screenshot

Admin Http Time Sync
(1) The main purpose of the program is synchronizing PC clock using HTTP protocol instead NTP or SNTP protocols. Some users and system administrators need such product because they have problems with standard (NTP,SNTP) synchronization. There are firewalls that make such synchronization difficult. ... (5) It has some additional useful options as time offset, synchronize periods, time sources choosing, etc. ... (4) Other special feature is supporting of bad PC time hardware. ... If you have fluent time error you can synchronize computer every hour.
http://dn.brigsoft.biz/AdminHttpTimeInst.exe - 606Kb - Download - Screenshot

Sync-It with Atom
Sync-It with Atom is a network time protocol client that calibrates the system time of your computer with a timeserver on the Internet. Features include automatic selection of the closest server, scheduled time synchronization, taskbar tray support and easy-to-use and attractive user interface.
http://www.tolvanen.com/syncit/syncit24.zip - 558Kb - 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... Otherwise the program checks for Internet connection, then tries to synchronize your clock and ends its work if succeeded. ... Synchronization is done automatically while you are receiving your e-mail or surfing the web and no actions are to be done by you.
http://www.brigsoft.com/atomic-clock-sync/download/BsAtomicInst.exe - 543Kb - Download - Screenshot