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Fping (open source) - fping is a program to send ICMP echo probes to network hosts, similar to ping, but much better performing when pinging multiple hosts.
benchmark.js - A benchmarking library that supports high-resolution timers & returns statistically significant results.
PingDoctor - PingDoctor is software that is considered to be the most powerful and easiest to use network route analyzer.
PPerf - PowerShell Iperf GUI - A PowerShell script to start iperf and show the output (similar to Jperf).
PingInfoView - PingInfoView is a small utility that allows you to easily ping multiple host names and IP addresses, and watch the result in one table.
iperf - A TCP, UDP, and SCTP network bandwidth measurement tool