Yup. I haven't seen Bob Brozman live, yet, but over the winter I've seen Makana, Jeff Peterson and Hapa at KMC; John Keawe and Kuahiwis at the Volcano Park Visitor Center; Sonny Lim (and Jeff Peterson and Nathan Aweau again) at Waimea; Keoki Kahumoku at Pahoa; and Robert Tripp Jr. and Cyril Pahinui at Hilo. So lots of open tunings.
Been learning from Cyril, who plays in Gabby's C tuning... C G E G C E ... and when the high C is lowered to B, it's called Gabby's C Wahine or Hi'ilawe.
The name Sebastopol (or Sevastopol) for Open D or Open C or Open E (because the intervals are associated with a tune called Sebastopol Blues) tends to be used more by bottleneck blues players than slack-key, in my experience. Keith Richards of The Rolling Stones plays a Sebastopol E tuning on many songs, often with just 5 strings. And the intervals of Open G or Open A are sometime called Spanish Tuning.
So many tunings, so little time... :)