[drannex]

Their built in indexing and searching system is really where they shine. The ability to #tag content throughout a document, create and link to internal documents and have all the the links update as file names change or are moved is really why the program is as solid as it is

And all of that while keeping hold of your data in simple readable formats! while the software isn't OSS, it is free and you can use any older version to sync with your server of choice. The extension ecosystem is insanely healthy, productive, and easy to write your own that works on both desktop and mobile.

Note: If you are on Linux DO NOT INSTALL THE SNAP - its really, really slow. The flatpak or AppImage are perfectly fine.