You can do that with Boostnote, but while you edit markdown + a bunch of extensions (better table support, latex math, etc) the other half of the editor renders

You can do that with Boostnote, but while you edit markdown + a bunch of extensions (better table support, latex math, etc) the other half of the editor renders it (same as e.g github does) which makes certain things (tables, math equations, images) much, much more readable. It stores the notes as plain text, though the file names aren't nice (it generates a GUID, because you don't have titles as such in the program).