diagrams.net

app.diagrams.net

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A free, open-source diagramming tool for flowcharts, UML, network and org charts, which saves to your device, Google Drive, GitHub and more. Formerly known as draw.io.

Why it is useful

A capable alternative to paid diagramming software that needs no account. You choose where files are saved, and it exports to PNG, SVG and PDF, so your diagrams are not locked into the service.