Tools for processing and displaying xy and xyz datasets Formula was removed
Last version was

Revision: 1

gmt requires the following formulae to be installed:
xz 5.2.3 General-purpose data compression with high compression ratio
cmake 3.11.1 Cross-platform make
gdal 2.2.4 Geospatial Data Abstraction Library
fftw 3.3.7_1 C routines to compute the Discrete Fourier Transform
pcre 8.42 Perl compatible regular expressions library

Recent formula history

FX Coudert gmt, gmt4: migrate to homebrew/core
Dongdong Tian gmt 5.4.2
Dongdong Tian gmt 5.4.1
Michka Popoff gmt: revision for hdf5
Claudio Satriano gmt 5.3.2

Formula code at GitHub