Wandel is really cool. Highly recommend his woodworking channel. Some of my favorite things he's made cluster around making high precision things with tools that are usually easy to use imprecisely.
Copy Carver - kind of a manually run 3D CNC, lets the user 'trace' in 3 dimensions:
https://www.youtube.com/watch?v=LyNu8lpQI1g
Pantorouter - build an oversized template, then end-cut a piece in a way that scales down that template (effectively multiplying precision of the template to achieve precision you wouldn't be able to get otherwise)