Basically, looking for hardware that’s open source that runs or can run on open source software, that controls PC fans, led lights, and or water cooling pump systems.
Something like this but that’s already available: https://shop.sasakaranovic.com/products/openfan-pc-fan-controller
Ideally with GUI but not necessary if there’s no option
Pretty much any fan controller should work with any software that can access it though USB. LEDs is a bit more complex though. OpenRGB may have what you are looking for.
I use OpenRGB, which works for my keyboard. But the led strips and GPU, even though it detects them, funny light up with it.
They never worked with any other software either though.