LANBench!

iperf is a tool for active measurements of the maximum achievable bandwidth on IP networks. It supports tuning of various parameters related to timing, protocols, and buffers. For each test it reports the bandwidth, loss, and other parameters.

PassMark PerformanceTest benchmarks the speed of your PC computer hardware, then compares the result to other machines. Includes disk, 3D and CPU tests.

LAN Speed Test is a FREE utility designed to accurately measure LAN speeds. It does this by writing a file (you choose the size) to a folder (again you choose), clears windows file cache (otherwise read times would be skewed with results way too high), reads the file back, clears the cache again, deletes the file, and displays the results. LAN Speed Test is a portable windows application that works with windows 98SE, WindowsME, Windows 2000, Windows 2003, Windows XP, Windows Vista, & Windows 7. Just Download and run. No installation needed, no dll's and leaves nothing in your windows registry.For the newer and better Version 2.0 registration you pay $5.00 per Paypal: http://www.totusoft.com/lanspeed2.html »

NetStress includes the following features:

PPerf - PowerShell Iperf GUI

NetIO-GUI is a Windows frontend for the multiplatform commandline utility 'netio'.

This project gives a better UI and new functionalities to the initial JPerf 1.0 project based on the iperf network bandwidth measurement tool.

A utility for testing the performance of a wireless or wired network that sends TCP and UDP data streams and computes important metrics: upstream and downstream throughput values, packet loss, and round-trip time, etc. It supports both IPv4 and IPv6 connections.