What application can be used to draw a flowchart like this taken from here. Does anybody know?
My operating system is Windows. Any other operating system is fine. A paid product is fine too :)
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IMHO, the graphics in question was made with Microsoft Visio. It's from Microsoft and available in 2019 Standard version for ~440 €. It works on Windows.
Before you try MS Visio, have a look at yEd. It's free, works on Windows as well and can also draw flowcharts.
You can adjust the colors etc. to make it look closer to Visio.
Downside: I needed to get used to its usability. It doesn't behave like I expected it would. Usually I accidentally draw a lot of more boxes than needed.
Inspiration can do this. It costs £60.
That looks like Visio to me. Personally I use Visual Paradigm, its a lot more than a drawing tool ...but it is a very good drawing tool.