I've just had a quick look, and I've already found the fretboard.py app useful. I have a 9-string guitar (low C#, F#, B below the usual strings) which I've never really made much use of, and adding a new tuning to the .json file was easy enough, and straight away I can use it to map things out on the fretboard.
When I get some time, I want to look into using this to produce PDF output for worksheets as it'll be a lot quicker than my current workflow for producing scale diagrams for pupils.
Thanks!