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Abstract The Generic Mapping Tools (GMT) is one of the most used toolsets in the Earth, Ocean, and Planetary sciences, originating as far back as the 1980s. It is an early example of an open‐source software code modeled after contemporaneous UNIX tools, and it was one of the first to employ PostScript as its graphics language and netCDF for binary files to ensure portability across different computing platforms. Here I trace the origin and evolution of GMT to the present day. The additions of MATLAB, Python, and Julia wrappers around the GMT C Application Program Interface (API) are now introducing GMT to numerous new and younger users and the platform shows no sign of diminishing after almost 40 years; in fact, usage continues to expand. Pursuing GMT for fun (and funding) has positively affected other areas of my scientific interests, and my new research modules continue to be added to GMT. The future holds many promises but will require formation and leadership of communities to steer and maintain the essential science tools that have served us well for many decades. 

SUMMARY Seamounts are volcanic constructs that litter the seafloor. They are important for understanding numerous aspects of marine science, such as plate tectonics, the volcanic melt budget, oceanic circulation, tsunami wave diffraction, tidal energy dissipation and mass wasting. Geometrically, seamounts come in many sizes and shapes, and for the purpose of modelling them for morphological, gravimetric or isostatic studies it is convenient to have simple analytical models whose properties are well known. Here, we present a family of seamount models that may be used in such studies, covering both the initial construction phase and later mass-wasting by sectoral collapses. We also derive realistic axisymmetric density variations that are compatible with observed first-order structure from seismic tomography studies.