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ucspi-tcp is a public domain Unix TCP command-line tool for building TCP client-server applications. It consists of super-server tcpserver and tcpclient application.

From "Life with qmail", Dave Sill, 2 January 2006 (Appendix B.3.): ucspi-tcp is an acronym for UNIX Client-Server Program Interface for TCP, and it is pronounced ooks-pie tee see pee.

tcpserver features built-in TCP Wrapper-like access control.