HttpWatch : An HTTP Viewer and HTTP Sniffer for IE and Firefox
OpenDNS : The safest, smartest, fastest and most reliable DNS on the planet.
Vaurien : Vaurien is basically a Chaos Monkey for your TCP connections. Vaurien acts as a proxy between your application and any backend.
You can use it in your...
SonoBus : SonoBus is an easy to use application for streaming high-quality, low-latency peer-to-peer audio between devices over the internet or a local network....
Wireshark is the world's foremost network protocol analyzer. It lets you see what's happening on your network at a microscopic level. It is the de facto (and often de jure) standard across many industries and educational institutions.