Who programs these fake applications for movies/series? Or are these just gifs/images?

No clue what you mean

@hjk101 For example this "web browser" which has a wonky url "Digital_Archive/Session_Timed_out//gibberish.gibberish".

And looks a bit like chrome but absolutely isn't chrome.

@jonas-w
That's actually specialised film prop companies.
Like scenery masters but crappy in actual programming.
Didn't think that there were much to it but they have a lot to consider in terms of rights management, commercial content, market restrictions and youth protection and such.

@scor
And the film producers wishes in what it shall show or look alike, of course.
Managers.. Pfft!

@scor ugh true didn't think about that. My first thought was like damn that must be a bomb job programming useless software that gets used for 5 seconds but well yeah burocracy and managers/producers... nope

They're generally made by the art department. Some times completely animated, with either the actor matching the animation (when done in-camera) or the animation matching the movements of the actor (when the animation is composited in during post production).

Other times, like when a real site like google is needed or showing terminal commands, they will screen record the needed action separately and then either play or composite the recording in like they would any other animation.

There might be a few cases of a production throwing a little html or a few bash commands together to get the right look, but that would still be done by an art department.

Baring maybe a few exceptions that prove the rule, media productions don't hire coders to build fake sites or create fake software. It's all illusion and trickery.

i wonder if they do stuff in those design mockup software. the most those things do is navigate through windows