xmipy is an extension to bmipy including an implementation of the abstract methods.
The extended interface is required to couple certain hydrological kernels, particularly MODFLOW 6. Currently it is a joint development of the USGS and Deltares. The imod_coupler uses it, for example, to couple MODFLOW 6 and MetaSWAP.
xmipy can be downloaded from conda-forge or PyPI.
In order to develop on xmipy, you have to download pixi.
Pixi can be downloaded at pixi.sh.
In order to run the test suite, execute:
pixi run tests