KeyCDN Tools - Website speed test, online curl, ping tool, https/2 and other services
TCPView - TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on...
Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.
CurrPorts - CurrPorts displays the list of all currently opened TCP/IP and UDP ports on your local computer.
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.
Proc Net Monitor - SecurityXploded is an Infosec Research Organization offering 200+ FREE Security/Password Recovery Tools, latest Research Articles and FREE Training on Reversing/Malware Analysis