Port-relaying program for your Mac
Version: 1.1.1SimpleRelay is a free and open source, simple port-relaying program written in Java.
Operating System: Mac OS X
Sits on specified ports for either TCP or UDP, re-sends packets to the given IP.
Doesn't forward packets, actually receives and re-sends them. Could be handy to learn Java Sockets/networking.
NOTE: SimpleRelay is licensed and distributed under the terms of the Public Domain license.