Beagle Software: NTP, Daytime timeserver and client software and hardware.
Brandywine Communications: Offers advanced off-the-shelf and custom hardware time and frequency solutions including Network Time Protocol servers.
ELPROMA NTP Servers: European manufacturer of NTP Time Servers.
EndRun Technologies: Provider of time and frequency equipment including NTP Servers.
Galleon Systems: Provider of NTP time synchronisation solutions using the MSF radio signal and GPS satellites.
Meinberg LANTIME: A family of hardware Network Time Servers (NTP) for IPv4 and IPv6 networks.
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.
NIST Web Clock: Shows the official US time in each time zone.
NPL Computer Time Services - Truetime/NPL Phoneclock: Synchronization to UK time by telephone.
NTP with TymServer: Hardware NTP time server manufacturer.
Open NTPD: A mainly BSD implementation of the Network Time Protocol.
Spectracom: GPS hardware NTP and SNTP clocks.: Manufacturer of hardware GPS clocks and NTP/SNTP servers. Legally traceable time.
Symmetricom, Inc.: Offers a variety of timing equipment including dedicated NTP servers.
TimeTools: Specializes in computer and network timing solutions. Using NTP for network time synchronisation in conjunction with MSF, DCF-77 and GPS time sources.