yEd Graph Editor

yEd is a powerful desktop application that can be used to quickly and effectively generate high-quality diagrams.
Create diagrams manually, or import your external data for analysis. Our automatic layout algorithms arrange even large data sets with just the press of a button.
yEd is freely available and runs on all major platforms: Windows, Unix/Linux, and Mac OS X.

https://www.yworks.com/products/yed

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