As my need for accuracy increased, I started using mrcal, a great camera calibration tool. But I found it didn't fit my workflow well in terms of workflow and as a software dependency.
What I wanted from a calibration library was:
Accuracy (obviously)
Trivial dependency, both calibration time and runtime
Simple and notebook-friendly python API
Support for both OpenCV and spline distortion models
Great built-in analysis tools
Board warp estimation
Outlier filtering
So that's what I built!
Would love feedback from other robotics / computer vision folks.