Which software was used to draw this diagram?

[Red_Micro]

Does anyone know which software was used to draw this diagram I randomly found on the internet? (See attachment)

[alexanderbrevig]

Looks hand drawn to me. GIMP og Inkscape (or equivalent) maybe?

[voltsandjolts]

I would use inkscape for that sort of thing. It's well worth learning the basics of using it. And its free. (inkscape.org)

But the fonts in the picture hint it might be something more microsofty, like MS Visio.

[Nominal Animal]

I use Inkscape and Dia to draw such diagrams.  Examples:




When I have textual data/database/CSV/program output I want to visualize into a graph/net/diagram, I use Graphviz to convert the node and edge descriptions to an SVG image, then either finesse it in Inkscape or redraw in Dia.  For example:



All of these are free and open source, and available (as both downloadable binaries as well as source code) for Windows, Mac, and Linux.

[SiliconWizard]

If you're looking for open-source solutions, what has been mentioned above is pretty much it.

I used to use Dia, but it hasn't been updated in years now and I find it pretty annoying these days. I now mainly use yED for diagrams: https://www.yworks.com/products/yed
Both can export to EPS and SVG, among other formats, so that's good for publishing.

[Alex Eisenhut]

Don't forget if you want to install gigabytes of slow-loading and frustrating software, there's Libre Office Draw too.

[Benta]

My first guess would be Powerpoint.

[ajb]

That looks like it could have been drawn in just about anything from MS Paint to Photoshop. 

I now mainly use yED for diagrams: https://www.yworks.com/products/yed

I will second this.  yEd has been tremendously useful for me, though not without its quirks.