The lower 6 strings are Baritone DADGAD (AEADEA), but there is an extra high e string.
This tuning is based on Extended Baritone Standard. It has similar benefits (allowing anyone familiar with DADGAD to take full advantage of the lower strings on a 7 string), while also having a nice symmetry in its own right.
Both the lowest and highest 2 strings form open A power chords. Both the lowest and highest 3 strings form extended power chords (though they are inversions of each other). It also has both more low range than DADGAD and more high range (going a fourth lower and a whole step higher).
It may require slightly heavier strings than usual, since the "G" is lowered 3 semitones (though I haven't tested this, as I don't currently have a 7-string).
I came up with this on my own (Oct 6 2020), but someone else might have done it first.
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Instrumental cover of Nocturne the lead single from Tesseracts 2013 masterpiece...
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