New office welcome screen with intercom, whats possible?

[Dujith]

So we just moved to a new location and now i'm busy figuring out what todo with the entrance.

At the entrance we want a screen with a welcome message and an intercom function for ourself and the top floor we are renting out atm.

 

I was thinking about getting a touchscreen with mic and webcam (https://iiyama.com/gb_en/products/prolite-t2735msc-b3/) and hooking up a pc/nuc.

The problem i'm facing is that the screen will have to run 2-3 different programs and i want have them in 1 screen. That would be the intercom (sip based), welcome/attendance (if the company is in) and some home automation stuff (knx). None of it has to be windows so if there is a better way in linux let me know  

 

Any ideas in which direction i should look?