draw.io — редактор диаграмм и схем

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drawio (diagrams.net) is an open-source diagram and chart editor: flowcharts, process diagrams, ER and UML diagrams, network diagrams, wireframes, and much more. Reach for it when you need to draw a diagram without cloud lock-in or a subscription: sketch a flowchart, a system architecture, a mind map, or an org chart, work in the browser or a desktop app, and keep files yourself (including in a git-friendly format). It has a rich shape set, export to PNG/SVG/PDF, integrations with various storage, and a self-hosted option. Its focus is a universal manual diagram editor with full control over files, not a diagram generator from code/text (mermaid for that) or a data tool: the value is drawing any diagrams flexibly and privately. It suits anyone who regularly needs diagrams — from engineers to managers — without cloud lock-in.