TCPView - TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on...
PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
TcpView For Linux - TcpView For Linux. Touch screen friendly design graphical network connections viewer for Linux.
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
NetStat Agent - At whatever point you open a site association through your program or download documents, you are opening TCP/UDP connions.
Komodia Relay - Free open source tool to perform TCP based session relay