I have several distinct hobbies that I use Perl to support.

I'm a tablet weaver, and I cooked up Weaving::Tablet for pattern drafting. Lately I've added (but not published) scripts that render patterns in SVG to get them into print form.

I also maintain an heraldic database in the SCA (Morsulus Herald, if that means anything), and the codebase I inherited was in Perl and large parts of it remain intact 25 years later. It's clear that it was originally written in Perl 4. I've modernized what I needed to and written more code for my purposes and moved the database into a SQLite database.