I'm trying to help someone redo the information architecture of a website that has a few hundred pages. They've been giving me charts made in Excel and it's impossible to move things around or do anything really. I suggested Visio, but they don't want to pay for that. Do you guys know of any good diagramming tools (free preferred) that could handle a task like this?
All I want to do is show pages of the site and their links to help them visualize where content will go, and show them how visitors will navigate the site.