Background
While Microsoft Visio is the most known diagram editor, which can be used to draw flow charts, structures, models, etc., there are a few decent, free alternatives.
Recommendation
The tool we prefer in this area is Dia, an open-source application that is rather complete.
Web links
Dia
Web site: http://dia-installer.de/index_en.html
Download: http://dia-installer.de/download.html
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