Slickplan helps you plan visual maps for websites, and makes images, PDFs and links to send to website owners for discussion during the design stages. It’s easy to use. There’s an example here, based on a small part of the the Mind-Mapping.Org website.
This is a free, online web app, based in your browser, so there’s nothing to download or install.
I see no way of making flowcharts with this, despite its claims to be a sitemap/flowchart generator. There are no conditional diamonds, nor any shape other than rectangles.
If you’re on Twitter and tweet about mapping topics,
tweet me — I’d love to know and follow you.