An SNTPclient for Virtual PC. It is for machines that do not have a sane time and a working hardware RTC. It synchronize the system time frequently with a nearby NTP server. It uses settimeofday(). It is based on RFC 1769 and RFC 1305.
picoSNTP is an SNTP time synchronization client for DOS. It requires a 8086-compatible CPU, and a working network connectivity via a packet driver. It's based on the picoTCP stack (and more specifically, on its DOS fork - picotcp4dos)
NetTime is a simple, free time synchronization client for Win32, providing a client and server for SNTP and RFC868. Its main claim to fame is that it is small, simple and unobtrusive.
U(niversal).Time is a multi-protocol network time client, written in C#. Both command line and GUI tools are available for .NET / Mono. U.Time supports SNTP (RFC2030) / Time (RFC868) / Daytime (RFC867) / HTP (via the HTTP Date header).
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AtomicDate is a Simple Network Time Protocol (SNTP) implementation in Java, as described by RFC 2030. It's composed by a client/server framework and works as an extension to java.util.Date class.
SNTPclient based on RFC 2030 supporting both IPv4 and IPv6 implemented purely on python. TFTP client and server based on RFC 1305 supporting both IPv4 and IPv6 implemented purely on python. OSPFv2 implementation in python using RFC 2328 and RFC 3137.