ArcGIS is not available for Mac but there is one alternative that runs on macOS with similar functionality. The best Mac Programming Language alternative is R (programming language), which is both free and Open Source. If that doesn't work for you, our users have ranked more than 50 alternatives to ArcGIS, but unfortunately only one of them is a Programming Language available for Mac. If you can't find an alternative you can try to remove all filters.
R is a free software environment for statistical computing and graphics. It is a GNU project which is similar to the S language and environment which was developed at Bell Laboratories (formerly AT&T, now Lucent Technologies) by John Chambers and colleagues. R can be consider.
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Even though this programming language is not specific to spatial data, the vast collection of R packages available for importing, processing, analysing, converting and visualising spatial makes it an excellent alternative that can create fully reproducible processes. Searching "R Spatial" online will bring up a wealth of books, tutorials and resources.