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).
Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.
WinPcap - Industry-standard tool for link-layer network access in Windows.
PingDoctor - PingDoctor is software that is considered to be the most powerful and easiest to use network route analyzer.
Npcap - Npcap is the Nmap Project's packet sniffing library for Windows.
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.