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Raspberry Pi is a series of small single-board computers. It is widely used in many areas because of its low cost, modularity, and open design. It is typically used by computer and electronic hobbyists.
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I have something similar to this, but I initially used an old android tablet running Macro Deck, an open source application that basically replies a stream deck. It has a good ecosystem of plugins for stuff like home assistant, and it was easy to add command line stuff to talk to custom electronics.
The upgrade path is good too. I ultimately switched it out for custom hardware, but it just sends keyboard shortcuts to trigger macro deck.
Ah, I've got a old android phone that could be perfect for this. Thanks for the heads up about Macro Deck!
By the way, does Macro Deck utilize multi touch support? That could enable the use of modifier keys to expand the button functionality, without having the add so many dedicated buttons. For example, the video makes use of modifier for individually switching the keyboard and mouse without changing the video, in case using a multi screen KVM setup.
I use separate buttons for that, but it has pages, so you could do something with that.
We do loads of this kinda thing in live events. The medium gigs & up are basically just networking computers and kit, and controlling/monitoring them all through 1 system.
The most popular setup is Bitfocus Companion along with an elgato streamdeck.
But I've seen other systems like Universe Control, PB Widget Designer, Touchdesigner, Node-Red....