Ask Lemmy

I love the WASD Code it's just built like a workhorse. Their newer models have backlighting but it's all white, the only thing you can RGB is the 3 indicator LEDs (caps lock etc...) which are very discrete and personalizing them is entirely optional. No software, everything is done & stored on-board. They're pricy but usually they'll have some banger black friday or holiday sales.

I use a Cooler Master Masterkeys Pro M white LED board with MX Blue switches. It's nominally a gaming board but it's very subtle, the "It's a gaming product so it has to look like Gigatron's left knee cap" is held to a minimum. I mainly use the backlights in the "all keys lit" mode at its dimmest brightness or turned off.

Filco is a typist's professional keyboard.

Kinesis makes outstanding keyboards with no RGB. Keychron makes good keyboards that you can disable the RGB on.

If you really want the retro experience, you can get a modern USB version of the original IBM Model M keyboard from Unicomp (https://pckeyboard.com/). I believe these are made on the same equipment that made the Model M back in the day. Buckling spring keys, metal frame, huge, heavy, and loud. Lots of configuration options and the only lights on them are the (admittedly annoyingly bright blue) lock status LEDs. I've used an original Model M and own one of these. They're amazing.