My main side project is Pivotuner[0], a MIDI effect plugin for adaptive pure intonation
It enables some pretty cool things like fairly straightforward microtonal modulation! Right now I'm working on a paper to submit to a computer music conference about it. Happy to send the draft if anyone's interested (email on website in bio).
I released it last December. I've had a couple sales, not many, but still enough to cover the cost of Apple developer membership, so at least I'm sort of in the positive!
Should also mention that I've gotten feedback on it from some pretty major artists, including Grammy nominees and winners like Jacob Collier! which is very very exciting
Happy to answer any questions!
[0]: https://www.dmitrivolkov.com/projects/pivotuner/