I now take interest, and strongly suggest, the "Scale Finder" offer the tuning keys on the guitar neck with a +/- icon under each tuning key allowing each string to be altered in half step tones. Jimi Hendrix often played in an Eb while Black Sabbath and other musicians and bands would tune even lower. I know the notes could be calculated but being able to tune down and see each note per fret as a reference would be "much" more helpful.
I, myself, am going to layout a guitar neck, in a graphics application, with the strings tuned down to D, and print it out for use as reference. I am usually tuned down to D for most of my songs which pertain to Heavy Metal.
If anyone needed/wanted a copy of my tuned down layout just let me know and I'd be happy to upload to you!
Thanks again for your suggestions!