Dia is a free and open-source diagram creation software, often described as a free alternative to Microsoft Visio. It allows users to create a wide variety of diagrams, including flowcharts, network diagrams, UML diagrams, and more. Dia uses a modular design, offering a variety of "shapes" to represent different elements within a diagram, and supports exporting diagrams in multiple formats, such as EPS, SVG, PNG, and JPEG. Its simplicity and versatility make it a popular choice for both casual and professional diagramming needs.
