My most successful project, by far, is a font. As a software engineer, I find that slightly amusing. None of my software projects got anywhere near its traction.
Except, maybe, an Emacs plugin made as a joke that adds IBM Selectric typewriter sounds to your text editor.
What is the font and its story?
It’s https://github.com/rbanffy/3270font. It’s a terminal font based on 70’s IBM terminals. It’s been used in art projects and on the cover of a magazine, and it’s offered packaged in the Debian and Ubuntu repos.