nikon - which brand ecosystem is more open for hacking?

I'm a seasoned photographer who used to have a nikon until recently and I am now thinking of buying a new camera and want to experiment more with it. The types of things I want to do is:

1. control the shutter based on signals from a computer (based on sensors/external timers/etc) or arduino boards



2. Look into the software to change some of the limits (min ISO, bracketing, etc)


3. Especially, I want to look at and learn from other peoples' project with their cameras.

Hence, do you know which brand between Canon and Nikon would have this open hacking ecosystem around it?

And where can I find forums/github repos/DIY/etc where people talk about that stuff?

Thanks