I absolutely second this, if you aren't worried about built-in syncing (I use Syncthing to solve this, also cool piece of software), and if you really like the idea of Markdown/text-only notes with image/file attachments, there is absolutely no better tool. Plus, if you think you can get value out of the note linking feature, you can make some incredibly detailed knowledge bases. Really powerful tool when you need it to be, dead simple note-taking by default, it's a damn good app