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.

Proxifier - Proxifier extends the advantages of a proxy server to network applications that don't natively support it.

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

FreeCap - FreeCap - is a program for transparency redirect connections from programs through SOCKS server.

OpenSpeedTest - Broadband Internet Speed Test Unlocked!

redsocks - Redsocks is a daemon running on the local system, that will transparently tunnel any TCP connection...