Most of my time is spent on GoatCounter, an open source web analytics platform available as a hosted service (free for non-commercial use) or self-hosted app. It aims to offer easy to use and meaningful privacy-friendly web analytics as an alternative to Google Analytics or Matomo. Also see Why I made GoatCounter.
I've also written (and maintain) a whole bunch of other stuff over the years;
some of the more useful ones (for me, anyway
You can consider sponsoring me if you find any of this useful
Feel free to just create a GitHub issue for questions, or just drop me an email at firstname.lastname@example.org. I'm usually happy to answer them :-)