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.

Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.

NetTK - NetTK, Network Tool Kit, is an Open Source alternative for monitoring and troubleshooting your...

tcpdump - tcpdump is a common packet analyzer that runs under the command line.

PingDoctor - PingDoctor is software that is considered to be the most powerful and easiest to use network route analyzer.

netcat - Netcat is a featured networking utility which reads and writes data across network connections...