Dia Diagram Editor.

Dia Diagram Editor is a drawing software for Windows, Mac OS X and Linux. Dia supports over 30 different diagram types such as flowcharts, network diagrams, database models. More than a thousand ready-made objects help to draw professional diagrams. Dia can read and write many different raster and vector image formats. Software developers and database experts can use Dia as a CASE tool to generate code skeletons from their drawings. Dia can be scripted and extended using Python.