CurrPorts - CurrPorts displays the list of all currently opened TCP/IP and UDP ports on your local computer.
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...
SmokePing - Smokeping is a tool for measuring latency.
TcpView For Linux - TcpView For Linux. Touch screen friendly design graphical network connections viewer for Linux.
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.