Salem is a cat. Salem is also a small library to do some geoscientific data processing and plotting. It extends xarray to add geolocalised subsetting, masking, and plotting operations to xarray’s DataArray and DataSet structures.
Salem is at a very early development stage and is more a proof of feasibility than a library for “everything you’ll ever have to do with geoscientific data”. There are plenty of more mature tools out there (see What others tools should I know about?). Salem basically reinvents the wheel, but in the way I want the wheel to be. Some might still find it useful: as an addition to xarray, or if you use the WRF model for example.