I program.
Some of my spare time is occupied by a few programming hobby-projects, including a game engine. They are written in the C programming language (the 1999 standard). When the time is right I will release the source code for anyone curious, but it is not public at this time.
The programming language I am most comfortable with is C. I like that it is a small language that is not bloated with features I don't need. I have also worked in Java, Python, R, Emacs Lisp, C++, and assembly for x86_64 CPU architecture.
I am interested in learning about decompilation and static recompilation of old games, but I have not had time for it yet.
Almost all my computer work is done using GNU Emacs. This includes programming, but also typing up math in LaTeX.
I do not use so-called AI while programming.