Dia can be used to draw a variety of diagrams to suit your needs, such as entity-relationship models, UML diagrams, flowcharts, network diagrams, and simple circuits.
It can load and save diagrams to a custom XML format, and export diagrams to a number of formats including EPS, SVG, XFIG, WMF and PNG. You can also print diagrams, including those that span multiple pages.
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(Source: www.theopendisc.com - dia-installer.de)