TCPView - TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on...
PingInfoView - PingInfoView is a small utility that allows you to easily ping multiple host names and IP addresses, and watch the result in one table.
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.
SmokePing - Smokeping is a tool for measuring latency.
Open Nettest - Open Nettest is a platform for collecting, processing and visualizing data related QoS and QoE.
PingPlotter - PingPlotter is a troubleshooting tool that helps IT professionals and neophytes identify, diagnose, and resolve network issues.