Not all of these are currently active but here are the distinct Pi's in my house.

- PiHole

- Home Automation controller

- Camera / temp / humidity monitor for grow closet and at time 3d printer

- A 3d printer I used to have had a raspberry pi as it's board (I think, maybe it was a clone).

- I'm pretty sure my CNC machine uses a pi

- As another commenter mentioned, I used to have a Pi built into a NES for emulator purposes.