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SACK TCP Implementations
Both shipping and experimental.

TCP Implementation WG Mail Archive
The IETF tcpimpl working group was shut down in Sep 2000, but the mailing list still exists. Historic archive may also be of interest.

CPC/IP
CPC/IP is an implementation of the PPP, SLIP, IP, ICMP, UDP, TCP, DNS, TFTP, HTTP, ping, finger and telnet protocols for Amstrad CPC computers with an Amstrad, Pace or CPC Amstrad International serial interface. The code occupies about 14K, excluding the serial, filing system and IP buffers.

Experience with TCP Vegas from SunOS 4.1.3 to NetBSD 1.0
Including source code, descriptions of experiments, and links to other TCP Vegas resources.

Xinu TCP implementation
The implementation of TCP used in Comer's Xinu Unix-like operating system.

LiveDevices
Commercial embedded TCP/IP stack.

SCPS-TP
A suite of protocols aimed at space users. Includes an implementation of a protocol extending TCP.

4.4BSD-Lite2 TCP/IP stack implementation
This is the implementation that arguably most modern implementations are based on. Even though one of FreeBSD, OpenBSD, NetBSD, or BSD/OS would be used today rather than actual 4.4BSD, this code remains to a very large extent the reference implementation of TCP.

FreeBSD's TCP implementation
Based on TCP in 4.4BSD.

NetBSD's TCP implementation
Based on TCP in 4.4BSD.