xnemogcm
I am the core developer of xnemogcm. It is a python package that opens NEMO outputs and make them compliant with xgcm.
gsw-xarray
gsw-xarray.readthedocs.io/en/latest/
I am one of the 2 core developers of gsw-xarray. This is a wrapper around gsw that add the correct cf attributes (standard_name, units) when used with xarray datasets. If you use pint-xarray, it will also check the input units and convert them if necessary.
xgcm
xgcm.readthedocs.io/en/latest/
I participated to xgcm by writing some parts of the documentation (boundary conditions, NEMO example), correct some minors typos, and participated to discussion about vertical remapping.