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Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.
TCPView - TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on...
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.
CurrPorts - CurrPorts displays the list of all currently opened TCP/IP and UDP ports on your local computer.
PingDoctor - PingDoctor is software that is considered to be the most powerful and easiest to use network route analyzer.
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use