Many. I'm working (slowly) on a programming language (finally nailed what I wanted out of the backend and frontend after many implementations, now working on implementing the 'final version'), but I just started a company to develop biotech software with deep learning.

I made several games in various environments, like lisp + CEPL, UE4 or godot, or straight OGL + SDL. Some were 90% of the way to being published but then my collaborators all dropped (usually because they got bored). I actually like enginedev far more than gamedev, but either way, it's fun, too. Actually the first piece of software I ever wrote was a text adventure game in qbasic with sound and graphics and such when I was 8

I've also dabbled with ESP32's to make STM's e.g. like in https://dberard.com/home-built-stm/

I love tech, but I absolutely loathe "tech products" (all the consumer-grade "tech" gadgets that are pushed left and right).