Very cool. I've always loved music related software stuff like this.

I've been really interested in alternate tunings, or more accurately temperaments, since I this video about a just intoned cigar box guitar. I'm burning to build one of these for myself after hearing how cool that major third sounds: https://www.youtube.com/watch?v=6fkw_xtPU-0

In the meantime, I'll have to give these scales a whirl on my boring old equal temperament guitar ;)