JPerf - This project gives a better UI and new functionalities to the initial JPerf 1.
PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
iperf - A TCP, UDP, and SCTP network bandwidth measurement tool
Komodia Relay - Free open source tool to perform TCP based session relay
netperf - Netperf is a benchmark that can be used to measure the performance of many different types of networking. It provides tests for both unidirectional throughput, and end-to-end latency. - HewlettPack...
socat - socat is a relay for bidirectional data transfer between two independent data channels.