dia: dia (Diagram Drawing Tool) dia: dia: Dia is a program designed to draw diagrams. It can be used to draw a dia: variety of diagram types, including UML, Network, flowchart, and dia: others. The native file format for Dia is XML. It has print support, dia: and can export to a number of formats such as EPS, SVG, CGM and PNG. dia: dia: dia: dia: dia: