Open Nettest - Open Nettest is a platform for collecting, processing and visualizing data related QoS and QoE.
TCPView - TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on...
LibreSpeed - Self-hosted Speedtest for HTML5. Easy setup, examples, configurable, mobile friendly.
TcpView For Linux - TcpView For Linux. Touch screen friendly design graphical network connections viewer for Linux.
iperf - A TCP, UDP, and SCTP network bandwidth measurement tool
TCP Optimizer - SpeedGuide.net - The Broadband Guide. Cable modems, DSL, Wireless, Network security. Free speed tweaks and TCP/IP tools for optimizing system performance.