TCPView - TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on...
Open Nettest - Open Nettest is a platform for collecting, processing and visualizing data related QoS and QoE.
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.
WifiInfoView - Scans wireless networks in your area and displays extensive information, including: SSID, MAC Address, PHY Type (802.11g or 802.11n), RSSI, Signal Quality, Frequency, Channel Number, and more...
Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.