Network Time Services  
   Information on the time services provided by the U.S. Naval Observatory. Shows reference time server locations in the US on a map.
   http://tycho.usno.navy.mil/ntp.html

NIST Web Clock  
   Shows the official US time in each time zone.
   http://www.time.gov/

Network Time Protocol (NTP) Project.  
   The official page for the NTP Project. Contains information about the project, reference implementations of the protocol and software links.
   http://www.ntp.org

Brandywine Communications  
   Offers advanced off-the-shelf and custom hardware time and frequency solutions including Network Time Protocol servers.
   http://brandywinecomm.com/

ELPROMA NTP Servers  
   European manufacturer of NTP Time Servers.
   http://www.ntp-servers.com/

EndRun Technologies  
   Offers timing equipment designed to work in conjunction with NTP.
   http://www.endruntechnologies.com/

NTP with TymServer  
   Hardware NTP time server manufacturer.
   http://www.tymserve.com

Symmetricom, Inc.  
   Offers a variety of timing equipment including dedicated NTP servers.
   http://www.symmttm.com/products_network_timing.asp

NPL Computer Time Services - Truetime/NPL Phoneclock  
   Synchronization to UK time by telephone.
   http://www.npl.co.uk/time/truetime.html

Galleon Systems  
   Provider of NTP time synchronisation solutions using the MSF radio signal and GPS satellites.
   http://www.galleon.eu.com/

PresenTense Time Server  
   Multi protocol time server which synchronizes itself with any true time source and then acts as a time server for all network clients. Easy to set up but has powerful configuration settings for networks which require a high degree of accuracy. This means
   http://www.bytefusion.com/windows-time-server/xp-2000-time-server/ntp-windows-time-server/ntp-time-server-windows-time-server.htm

Beagle Software  
   NTP, Daytime timeserver and client software and hardware.
   http://www.beaglesoft.com

TimeTools computer and network timing solutions  
   TimeTools specializes in computer and network timing solutions. Using NTP for network time synchronisation in conjunction with MSF, DCF-77 and GPS time sources.
   http://www.timetools.co.uk

PresenTense NTP Auditor  
   PresenTense NTP Auditor monitors your computer's built-in clock and compares it's time to the real time. Most computer clocks lose or gain time so within a few days, your computer does not show the real time. PresenTense Auditor keeps your time client hon
   http://www.bytefusion.com/products/ntm/pta/whatispresentensentpauditor.htm

Meinberg LANTIME  
   A family of Network Time Servers (NTP) for IPv4 and IPv6 networks.
   http://www.meinberg.de/english/products/time-server.htm