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.
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 honest!
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 you can use PresenTense Server to synchronize your PC to a primary time source such as an atomic clock on the internet and offer time services to clients on your local area network. PresenTense server also allows synchronization to GPS receivers via RS-232 and the NMEA 0183 protocol. PresenTense Time Server ships with drivers for many reference clocks including Spectracom and Hopf.
Symmetricom, Inc.: Offers a variety of timing equipment including dedicated NTP servers.