Infographic software

I need to find some free infographic software for a particular purpose.

I have some data, a list of items and properties that these items share. I need each item to be a labeled vertex (or circle with the name of the item), and I need there to be lines between the items that share certain properties, where the width of the line is proportional to the number of properties they share.

I could do this by hand, but I’d really rather not, because it really is a lot of data.

Have any suggestions? Searching for “infographic network” does not give me the kind of results I need.

Look into Graphviz or Gephi.