The easiest way to implement a Geographic Information System is to use a projection where the Earth is divided on an equal latitude-longitude grid spacing. E.g. Plate Carrée.

Bash script to query, modify and create enviroment variables in Linux using a GUI created with dialog.

Wolfram Mathematica package with functions to express the terms of a polynomial like products of powers.

Useful Bash script to take notes quickly when working regularly with the Linux terminal.