Comment by vinc

More than I can count, but here are the big ones:

http://moros.cc - A hobby operating system, with a shell, an editor, a lisp interpreter, and many other little things

https://geodate.org - A lunisolar calendar with decimal time (centidays and dimidays)

https://github.com/vinc/geodate - An implementation of the calendar + time

https://github.com/vinc/geocal - A tool to visualize the calendar + time

https://github.com/vinc/littlewing - A chess engine written in Rust (and another one before that in C++)

https://vinc.cc/software/ - A more complete list, on my personal website

I'm good at scratching my own itches but less good at finding projects that could be useful to other people.