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Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
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.
PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
PingDoctor - PingDoctor is software that is considered to be the most powerful and easiest to use network route analyzer.
Komodia Relay - Free open source tool to perform TCP based session relay