if you're looking for scales in alternate tunings, an old website called "all guitar chords"[1] has got you covered, even if it's not as pretty an interface as OP's site. I found it very useful years ago when re-working some hindustani music for guitar in open C tuning. it's one of those sites I'm always a little surprised hasn't just vanished from the internet.

also, just because it's a saturday, I suggest anyone into open tunings on guitar check out this list of tunings used by james blackshaw.[2] his music is a lot of fun to play.

1. http://www.all-guitar-chords.com/guitar_scales.php

2. http://archive.fo/uqH3d