In recent years, I've written two!

I wrote my own wiki to use as a personal knowledge base to replace Dokuwiki because I wanted a simpler Markdown-based solution written in Python. I started it during the pandemic times and all of the code in there to date was written by hand. All of it was pretty easy except the CSS/layout parts which I'm just not very good at. It took months of free time to get it where I wanted.

I also recently created a day-to-day notes and daily planner app that's basically a bunch of markdown notes. I spent about a week of free time defining the problem, setting constraints, and refining with an LLM that wrote almost all of the code for me. I've been using it for months and it's working great.

The wiki uses Markdown because I browse it just as often as I edit and I appreciate some modicum of basic formatting. The daily notes app doesn't really _have_ to use markdown, I've just gotten accustomed to writing Markdown pretty much everywhere.

(These are on github, but I'm not posting the links here because I don't want to or care about promoting them.)