Technitium MAC Address Changer - Technitium MAC Address Changer (TMAC) is a freeware utility to instantly change or spoof MAC Address of any network card (NIC).
SmokePing - Smokeping is a tool for measuring latency.
TCP Optimizer - SpeedGuide.net - The Broadband Guide. Cable modems, DSL, Wireless, Network security. Free speed tweaks and TCP/IP tools for optimizing system performance.
Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.
Axence netTools - Axence netTools is completely free of charge, both for home and commercial use – all you have to do is to register. A tool for professionals – and others.
Open Nettest - Open Nettest is a platform for collecting, processing and visualizing data related QoS and QoE.