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PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
Dropbear SSH Server and Client - Dropbear is a relatively small SSH 2 server and client.
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
OpenSSH - OpenSSH is a free version of the SSH connectivity tools that technical users rely on.
Komodia Relay - Free open source tool to perform TCP based session relay
Ethereal - Ethereal® is used by network professionals around the world for troubleshooting, analysis...