What program are the developers using?

What program are the developers using?
Developers often show mockups of the interface, panels and nodes, they look like this:

What program do they use for this?

UPD!
Sorry, I didn’t put it exactly.
I am looking for a program to draw these mockups. I’d like to know the exact name of the program that the developers use.

I’m using yEd:


Very easy to use and it’s free.
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Actually, if you only need stuff from Blender, you can just go to Window > Save Screenshot…

the screenshot is Miro (www.miro.com).

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