I'm a huge fan of the Navdy heads up display for cars. Unfortunately they went out of business a couple of years ago and the display started losing functionality shortly afterwards due to linked services shutting down.
Ever since then I've been reverse engineering both the (android-based) firmware for the display and the Android companion phone app, restoring functions, maintaining phone compatibility and adding new features. Working on numerous bugs and features concurrently while also supporting new and existing users of the device has been taking up a growing amount of my personal time lately!

As well as this, I publish a patched version of the Fossil Hybrid Smartwatches android phone app, adding some sorely missed features in the official app such as Do-Not-Disturb support and improved app notification support.

I also do a lot of work with python and micropython, building and maintaining a number of open source packages for both as well as contributing to development of the micropython platform. I also run a CI builder for micropython, aiming to build binaries for almost all of the supported platforms for both releases and github master branch updates.