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Free open-source diagramming tool for flowcharts, UML, network and architecture diagrams. Works in browser or desktop, no signup required, data stays under your control with local or cloud storage options.

Free online editor for creating and previewing Mermaid diagrams in real time from text, ideal for developers who need version-friendly flowcharts and sequence diagrams.

Open-source text-to-diagram tool that turns plain-text descriptions into UML and other software diagrams, ideal for version-controlled docs and developer workflows.