Roughly inspired by Visio, Dia is program for informal diagram creation and editing. Use Dia to create different types of diagrams, including entity relationship diagrams, UML diagrams, flowcharts, network diagrams, and more. Dia can load and save diagrams to a custom XML format, print diagrams (including ones that span multiple pages), and can also export to a number of different formats, including EPS, SVG, XFIG, WMF, and PNG.