[prepend]

I couldn’t find the price or license on the web site. Is this free? How much does it cost?

[bjterry]

yEd is freeware. You can see the license by clicking one of the download links. I guess they monetize it by licensing the underlying diagramming libraries to businesses from the looks of it.

[kermatt]

DbVisualizer licenses one of their libraries for its ERD feature: https://www.dbvis.com/images/features/screens/navigator1.png