vnStat - vnStat is a console-based network traffic monitor for Linux and BSD that keeps a log of network...
PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
darkstat - darkstat is a packet sniffer which runs as a background process, captures network traffic...
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
ntop - ntopng High-Speed Web-based Traffic Analysis and Flow Collection ntopng is the next generation version of the original ntop, a network traffic probe that monitors network usage. ntopng is based on …
Komodia Relay - Free open source tool to perform TCP based session relay