jguitar.com is also very comprehensive in terms of chord fingering, scales, etc.
One major difference between jquitar.com and guitardashboard.com is that the facets (tuning, chords, scales, etc.) are separated from one other on jguitar.com, whereas guitardashboard.com tries to place them all onto a single screen. My initial reaction to guitardashboard.com is that this approach does succeed. However, jguitar.com has more to offer in total.
My thanks to both authors for helping us explorers of alternate tunings. Any help we can get is appreciated.