ProjPicker (projection picker) is a Python module that allows the user to select all coordinate reference systems (CRSs) whose extent completely contains given points, polylines, polygons, and bounding boxes using set-theoretic logical operators in a postfix notation. The goal is to make it easy and visual to select a desired projection by location. This project was motivated by a GRASS GIS feature request. A new GRASS GIS module g.projpicker that wraps around this project is available. It is a work in progress; join discussions.
ProjPicker running on Android using Termux