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iperf - A TCP, UDP, and SCTP network bandwidth measurement tool
socat - socat is a relay for bidirectional data transfer between two independent data channels.
JPerf - This project gives a better UI and new functionalities to the initial JPerf 1.
Komodia Relay - Free open source tool to perform TCP based session relay
NetStress - NetStress is a user-friendly benchmarking tool that is mostly used by networking professionals to measure the network performance of both wired and wireless connections.
AUTAPF - Reliable TCP and UDP port forwarding for Windows.