HS NTP C Source Library
HS NTP is a software library in C (supplied with full source code) which implements the client side of Network Time Protocol (NTP) over UDP socket layer according to RFC1769 and RFC1305. HS NTP Library allows a user application to synchronise local system time to remote NTP server time. ... Once HS NTP has received NTP time reply from NTP server it analyses the reply and reports the resulting time difference to user application via callback function. ... Modular design makes it easy to port HS NTP protocol module to any environment.
http://www.hillstone-software.com/hs_ntp_demo.exe - 68Kb - 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. ... If you have fluent time error you can synchronize computer every hour. ... (4) Other special feature is supporting of bad PC time hardware. ... If time jumps the program synchronizes PC clock immediately.
http://dn.brigsoft.biz/AdminHttpTimeInst.exe - 606Kb - 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. ... Default protocol version is NMEA 0183. ... It uses NMEA protocol. ... $GPZDA, $ZQZDA or $GPRMC protocol sentences are explored as time source. ... If you want to use this program you need a GPS (Global Positioning System) unit connecting to PC's COM port.
http://www.brigsoft.com/atomic-clock-sync/download/GpsTimeInst.exe - 447Kb - Download - Screenshot

SP TimeSync
SP TimeSync is a program with multilingual interface which lets you synchronize your computer's clock with any Internet atomic clock (time server). It uses a high precision network time protocol (NTP) which provides accuracy of several milliseconds depending on the characteristics of the...
http://www.spdialer.com/download/sptimesync23_x86.zip - 82Kb - Download - Screenshot

#1 Atomic Clock
Atomic Clock lets you synchronize your computer's clock with any Internet atomic clock (time server). It uses a high-precision network time protocol (NTP) which provides accuracy of several milliseconds depending on the characteristics of the synchronization source and network paths. ... Features: Skinned, Work as Time Server, Synchronize Periods, Import Time Servers List!
http://www.freefileszone.com/atomic-clock/download/acdemo.exe - 488Kb - 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. ... Otherwise the program checks for Internet connection, then tries to synchronize your clock and ends its work if succeeded. ... So as you see mostly the program is idle and is not wasting resources of your PC. ... 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/BSAtomicNPInst.exe - 522Kb - 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,... IBPTime is free of charge and includes complete e-mail technical support. ... 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...
http://pages.infinit.net/ibp/ibpt/ibpt150.zip - 1Mb - 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

PresenTense Time Server
PresenTense Time Server is a high performance Windows time server supporting NTP and SNTP protocols. You can use PresenTense Server to synchronize your PC to a primary time source such as an atomic clock on the internet or an inhouse GPS reciever and offer time services to clients on your local... Syslog server support added in version 3. ... 9. ... Fallback to an internet based time server if local GPS hardware fails. ... Installation automatically configures default time servers so in most cases, you have an operational time server after the install is complete.
http://www.bytefusion.com/download/bin/ptsvrdemo.exe - 4Mb - 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... They are open NTP (Network Time Protocol) servers. ... If one of the servers does not work the program chooses another. ... (*) This program uses the list of 19 presetting atomic time servers, that are situated all over the world (USA, UK, Australia, France, Germany etc.
http://www.brigsoft.com/atomic-clock-sync/download/BsAtomicInst.exe - 543Kb - Download - Screenshot