draw.io

draw.io Desktop is a free, open-source diagramming application used for creating flowcharts, organizational charts, network diagrams, wireframes, and other visual documentation. It's popular among software developers, business analysts, project managers, and students who need to create professional-looking diagrams quickly. The app works entirely offline and can export diagrams to various formats including PNG, JPEG, SVG, and PDF. It's also known as diagrams.net and offers the same functionality as the popular web version but as a standalone desktop application.