SACK TCP Implementations
Both shipping and experimental.

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

sevenstax
Commercial TCP/IP implementation for embedded processors.

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.

TCP Santa Cruz
An implementation aimed at improving TCP congestion control over internets with heterogeneous transmission media.

TCP-BFA
Implementation from Stanford; TCP Buffer Fill Avoidance.

The uIP TCP/IP Stack for Embedded Microcontrollers
An implementation of the TCP/IP protocol stack that uses very little resources. Code size is on the order of a few kilobytes and memory usage is on the order of a few hundreds of bytes.

TinyTCP/TinyFTP
A simple implementation of TCP & FTP, suitable for burning into ROM. It is, in effect, a hack put together in two or three days written in C--in 1986.

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