This was one of the main selling features for me (before I tried it and experienced all the other killer features). I’ve experienced a bad case of vendor-lock before where it was hell to export my data. So having it all available in plain text at all times is really reassuring.

Big fan of Obsidian. Especially for written notes. If you are working with a lot of images I’d give its canvas feature a try. I’m not using it personally, but I think it might fit the bill.