PeregrinePeregrine by SouthPawEngineer, a wireless ergonomic board with a built in trackpad module that can be removed and used separately.
The Peregrin is hot swappable, low profile, and uses Choc spacing for the sake of compactness.
The trackpad module is a ProLab mouse, which was a kickstarter. It uses a trackball module that is similar to the ones popping up around here, but is self contained and has a few additional buttons and acts as fully independent mouse.
It's a low tech way to integrate pointing functionality into a ZMK keyboard - it's simply attached with some velcro, so you can pull it out and use it separately.
Otherwise, the board has a Pro Micro compatible footprint because SouthPawEngineer has got lots of compatible boards that are both wired and wireless, so it makes it easy to throw in whatever controller.
I'm using the two five way switches and the small black tactile buttons you see in the top middle section as its own number row. The bottom middle piece is a low profile jog wheel rotary encoder.