Here's my first Cool Tools of the Month episode!
First off is Amped Wifi Analytics:
Use this tool to get detailed info on the wireless networks around you so you can optimize yours
Second is an awesome Google Chrome addon called Stylish that you can alter the apperance of many websites.
if facebook or google are too white and hurt your eyes than you can make them darker or just a different, more pleasing color.
Third is a network tool called PRTG and you can monitor uptime of various "sensors" of your network like bandwidth, uptime, packet sniffing, etc.
I use this to check on server health and performance