I'm in the exploratory phase of a few projects, meaning I haven't decided if they are compelling enough (or within my skillset) to push me to develop them properly. That said, the one project I've explored multiple times, each time getting a little closer to making the full mental commitment, is a word processor.

Not a "text editor" for code and whatnot, but a real-deal word processor for writing novels and such. I cloned Visicalc (onto the Pico-8), so my "How does a spreadsheet work?" itch has been scratched. I think it's finally time to answer for myself, "How does a word processor work?" (in pure C, to level-up those skills as well) So lately I've been working on small programmatic experiments to understand the underlying subsystems necessary to build one.