Create Flowcharts & Diagrams in Google Docs
You can add drawing objects like flowcharts, arrows, callouts, banners and even freehand scribbles to your documents in Google Docs. This is very similar to the drawing canvas of Microsoft Word.
flowcharts
Make a Site Map of your Website with WriteMaps
WriteMaps is a web based tool that you helps you quickly draw a conceptual diagram of your website online for free. You may also use the tool to plan the layout of an upcoming site or for generating the sitemap of an existing website.