I wanted to make a diagram of my home network so I could keep track of everything and how they’re connected. I could have used Dia or Visio, but I created it online instead. The site I used is called Gliffy, and its interface is extremely advanced for a web application. They’re blurring the line between a standalone application. (Note: It uses Flash, but works on Linux)
I decided not to publicize my network diagram, just to be on the safe side of security, so instead, here’s a diagram of my living room. It was very easy to create, especially having used Visio and Dia. You can also share your diagrams to collaborate with others.