Diagram Drawing Software Open Source. Dia Diagram Editor is free Open Source drawing software for Windows Mac OS X and Linux. Dia supports more than 30 different diagram types like flowcharts network diagrams database models.
It includes a standard symbol library but also allows you to create your customized symbols. This software also comes with a useful multi-tab interface that enables you to work on multiple state diagrams simultaneously. Drawio can import vsdx Gliffy and Lucidchart files.
It is open-source software and is a truly cross-platform app.
You can either use it as a simple web app or you can download native apps for. Dia Diagram Editor is free Open Source drawing software for Windows Mac OS X and Linux. It is also often used to draw one-line diagrams block diagrams and presentation drawings. You can create network diagrams posters flowcharts brochures and more for free.