None of my TVs are connected to the Internet. That said, I could really do with a better open source fullscreen UI, especially since I mainly just want a web browser that works good. I'm just using KDE Plasma with a custom daemon to control the TV power state over an HDMI CEC adapter plus an old K830 keyboard.

I'm, frankly, a bit annoyed by this whole thing; I'd rather have USB adapter RF wireless because it is simpler to deal with vs Bluetooth, but actually I can't even find other Bluetooth keyboards that are as compelling as this K830 and worse yet, they don't even make the K830 anymore. I don't really mind KDE Plasma with just some minor customizations but I don't really like any of the options like Kodi. Maybe Plasma BigScreen will eventually be what I want for that. And finally, HDMI CEC is a pain in the ass. For reasons, I actually use an adapter to get CEC support on a normal PC platform, because most PC HDMI ports can't do it. And also, it's just a bizarre and overly complicated thing. I have it working reliably, but it took some time to iron out all the kinks, particularly because my TV responds quite differently depending on how recently it was powered off.

I really just want a big monitor and to basically just use DPMS... Like a computer does, but large computer monitors tend to be expensive and don't always have remote controls, which admittedly are handy.