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No longer directly, but many geophysics departments have educational licenses. If yours doesn’t, push them to request one. Meanwhile, use Fatiando a Terra or SimPEG – both free and excellent for learning.
Need help finding open-source alternatives? Leave a comment below (on your original search platform) and the community will point you to tutorials for Python-based gravity/magnetic processing. Geosoft Oasis Montaj 8.4.1 Free Download