Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.

Proxycap - ProxyCap empowers you to divert your PC’s system associations through intermediary servers.

Multiping - Get MultiPing Support. Network monitoring in 60 seconds. MultiPing provides a graphical view of network performance, monitors hundreds of targets, and sends automatic alerts..

Proxy SwitchyOmega - Proxy SwitchyOmega is the updated version of the proxy settings for easily switching and managing the multiple proxy servers and files within minutes.

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.

FoxyProxy - FoxyProxy is a set of proxy and proxy switcher to reach the content of international market and easily switch between multiple proxies and proxy servers.