I have a few text files open at any one time. One is for a diary I keep, which changes for each month, so for example at the moment I have '2026 01.txt' open. I have a general to-do file and a tech todo file, and then notes.txt. When my notex.txt grows too long, which I define as having to scroll at all, I start to break it up.

When I break it up, I personally use latex files. I know everyone loves markdown, but I'm not a fan of Obsidian (closed source and electron, ugh), so I fell in love with TexStudio.

I have keybindings for simple macros to insert sections and subsections that I can quickly name, and these display in the navigation tree very well. TexStudio also allows multiple tex files open at once with a tabbedinterface, and allows saving sessions, so I can open one file to open all my, say, 'ai app ideas' notes. I've found this to work better for myself than any other available app or solution.

Eventually, I'd like to release a fork which would mainly be trimming stuff out rather than really adding anything in, but it's far from a priority for me at the moment.

I have so many text files (technically wikis and GDocs text docs, but I'm not doing more than lines of text). I was talking to a coworker today about our graveyard of pen and paper notebooks, todo apps, reminder thingies, post-its..

I need two things: ubiquity, so that I can add ideas, todos, etc. wherever I am; and exaggerated simplicity so that I don't end up turning the note solution into its own project that's abandoned or exchanged in a year.

I use TaskPaper. It's essentially markdown lists with a few bells and whistles for managing items.