I use textfiles...<p>Some are lists, like todo.txt<p>Some are individual topics, brainstorms, etc.<p>For organizing them, I put hashtags like #food inside.<p>Even thousands upon thousands of textfiles (which I'm nowhere near) grep quickly, archive and backup quickly, and transfer to other systems quickly, without lock-in or putting my eggs into someone else's basket.<p>I can even build my own UI on top of it... First, index them into a SQLite, then generate some HTML from it, and have a form which puts another textfile back into the directory. Best of all: the UI never changes without my consent.<p>After getting burned repeatedly by third-party systems with stupid UI changes, data migrations, just plain shutting down, leaking my data, your version is out of date, and your OS is not compatible with our new version, and your device is not compatible with the new OS version, etc., there's no way I'm using a third-party system for this ever again.